解:(1)438+203,
=438+200+3,
=641;
(2)256+199,
=256+200-1,
=455;
(3)416-302,
=416-300-2,
=114;
(4)325-198,
=325-200+2,
=127;
(5)278+498,
=278+500-2,
=776;
(6)3.6+2.7+6.4+7.3,
=(3.6+6.4)+(2.7+7.3),
=10+10,
=20;
(7)

+

+

+

=(


)+(


),
=1+3,
=4;
(8)1.3+4.25+3.7+3,
=(1.3+3.7)+(4.25+3),
=5+7.25,
=12.25;
(9)1874-324-476,
=1874-(324+476),
=1874-800,
=1074;
(10)5-1.4-1.6
=5-(1.4+1.6),
=5-3,
=2;
(11)30-8.12-4.13-7.75
=30-(8.12+4.13+7.75),
=30-20,
=10;
(11)

-

+

=

+

-

,
=1-

,
=

;
(12)4.3-2.45+5.7-6.55
=(4.3+5.7)-(2.45+6.55),
=10-9,
=1;
(13)125×48
=125×8×6,
=1000×6,
=6000;
(14)25×32
=25×4×8,
=100×8,
=800;
(15)35×1.4
=35×0.2×7,
=7×7,
=49;
(16)1.25×88
=1.25×(80+8),
=1.25×80+1.25×8,
=100+10,
=110;
(17)0.25×444
=0.25×4×111,
=111;
(18)32×0.25×12.5
=8×4×0.25×12.5,
=(8×12.5)×(4×0.25),
=100×1,
=100;
(19)25×80×0.04×125
=(125×80)×(25×0.04),
=10000×1,
=10000;
(20)1.9×4×0.5
=1.9×(4×0.5),
=1.9×2,
=3.8
(21)25×1.25×4×0.8
=(25×4)×(1.25×0.8),
=100×1,
=100;
(22)(1.6+1.6+1.6+1.6)×2.5
=1.6×(4×2.5),
=1.6×10,
=16;
(23)(0.7+0.7…+0.7)×12.5(80個(gè)0.7相加)
=80×0.7×12.5,
=80×12.5×0.7,
=1000×0.7,
=700;
(24)99×8.6+8.6
=(99+1)×8.6,
=100×8.6,
=860;
(25)99×5.4
=(100-1)×5.4,
=100×5.4-1×5.4,
=540-5.4,
=534.6;
(26)4.8×1.01
=4.8×(1+0.01),
=4.8×1+4.8×0.01,
=4.8+0.048,
=4.848;
(27)95×101-95
=95×(101-1),
=95×100,
=9500;
(28)95×102-190
=95×(100+2)-190,
=95×100+95×2-190,
=9500+190-190,
=9500;
(29)95.6×18+0.4×18
=18×(95.6+0.4),
=18×96,
=18×(100-4),
=18×100-18×4,
=1800-72,
=1728;
(30)(

-

+

)×12
=

×12

×12×

,
=4-2+3,
=5;
(31)(

+

-

)÷

=

×24

×24

×24,
=8+3-1,
=10;
(32)24×(

+

-

)
=

×24

×24

×24,
=8+3-1,
=10;
(33)24÷(

+

-

)
=24

,
=24×

,
=57.;
(34)1.25×3.6+1.25×

+

=1.25×(3.6+3.4+1),
=1.25×8,
=10;
(35)3.3×

+0.75×

+75%
=0.75×(3.3+5.7+1),
=0.75×10,
=7.5;
(36)

×6.6+7.5×

=6.6×(2.5+7.5),
=6.6×10,
=66;
(37)9.56×180-95.6×8
=9.56×180-9.56×80,
=9.56×(180-80),
=9.56×100,
=956;
(38)4.8×37+48×6.3
=48×3.7+48×6.3,
=48×(3.7+6.3),
=48×10,
=480;
(39)9.5×8.8+0.12×95
=(8.8+1.2)×9.5,
=10×9.5,
=950;
(40)

×21
=

×(20+1),
=

×20+

×1,
=19

;
(41)

×33
=

×(30+3),
=

×30+

×3,
=7+

,
=7

;
(42)

÷

,
=

=

;
(43)

÷

=

×48,
=

;
(44)

÷42,
=

×

,
=

;
(45)6×0.75+5×

-3÷4
=(6+5-1)×0.75,
=10×0.75,
=7.5;
(46)5.4÷1.2÷5
=5.4÷(1.2×5),
=5.4÷6,
=0.9;
(47)270÷18,
=15;
(48)120÷(1.2×4)
=120÷1.2÷4,
=100÷4,
=25;
(49)73÷0.8÷12.5
=73÷(0.8×12.5),
=73÷10,
=7.3;
(50)16÷2.5
=16÷(2.5×4)×4,
=16÷10×4,
=6.4;
(51)48÷1.25
=48÷(1.25×8)×8,
=48÷10×8,
=38.4;
(52)

-(

-

)+

=

-

+

+

,
=

;
(53)84-(54-16)
=84-54+16,
=46;
(54)84-(54+16)
=84-70,
=14;
(55)9999×7778+3333×6666
=9999×7778+3333×3×2222,
=9999×7778+9999×2222,
=9999×(7778+2222),
=9999×10000,
=99990000;
(56)3.6×31.4+43.9×6.4
=3.6×(43.9-12.5)+43.9×6.4,
=439-3.6×12.5,
=439-45,
=394;
(57)(

+

)×

=

×

+

×

,
=

+2,
=5

;
(58)

×

+

÷

=(


)×

,
=

;
(59)

-

-

=

-(

+

),
=

-1,
=

;
(60)

×

-

×

=

×(


),
=

×

,
=

;
(61)

×

÷

×

=

÷

×

,
=

;
(62)

-

×

-

=

-


,
=

-(


),
=

-1,
=

;
(63)

×[

÷(

+

)]
=

×[

×

+

×7],
=

×(

+3),
=

×


×3,
=


,
=

;
(64)(0.9+5)×3+2.3
=5.9×3+2.3,
=17.7+2.3,
=20;
(65)56×

=

;
(66)

+

÷

+

=

+


,
=1

;
(67)(

+

)÷(

+

)
=1÷1,
=1;
(68)

÷(

-

)
=

×

,
=

;
(69)(

-

)÷

=

×

-

×

,
=

-

,
=

;
(70)7.2÷(5-0.75-0.25)
=7.2÷[5-(0.75+0.25)],
=7.2÷(5-1),
=7.2÷4,
=1.8;
(71)6.4+3.6÷0.5+4.5
=6.4+7.2+4.5,
=18.1;
(72)(6.4+3.6)÷0.5+4.5
=10÷0.5+4.5,
=20+4.5,
=24.5;
(73)495÷55+495÷45
=9+11,
=20;
(74)8÷0.4+8÷1.6
=20+5,
=25;
(75)0.9+99×0.9
=0.9×(1+99),
=0.9×100,
=90;
(76)5.28-(1.62+2.28)
=5.28-2.28-1.62,
=3-1.62,
=1.38;
(77)

-

+

=0+

,
=

;
(78)4×(

+

)
=4×

+4×

,
=


,
=

;
(79)

+

+

+

=(


)+(


),
=1+1,
=2;
| | | |
(80)2-( + )- =2- , =2-( ), =2-1, =1; (81) × + × =( )× , =1× , = ; (82) × + × =( )× , =1× , = ; (83) ×9+ =(9+1)× , = ; (84)(20+ )× =20× + × , =14+ , =14 ; (85)(5+ )× =5× + × , =4+ , =4 ; (86)( + )×24 = ×24+ ×24, =4+3, =7; (87) ×39× =3× , = ; | | | |
(88)

×(

+

)
=

×


×

,
=1+

,
=1

;
(89)(

-

)×12
=

×12

×12,
=3-2,
=1;
(90)

×(26×

)
=

×

×26,
=6;
(91)

+

+

+

=(


)+(


),
=1+1,
=2;
(92)17×

-

=(17-1)×

,
=16×

,
=6;
(93)(

+

)×

=

×


×

,
=1+

,
=

;
(94)(

+

)÷

=

×

+

×

,
=

+1,
=1

;
(95)(

+

)÷3
=

×


×

,
=


,
=

;
(96)(

-

)÷

=

×9-

×9,
=


,
=

;
(97)

÷

+

÷

=(


)×

,
=

;
(98)

×(10+

)
=

×10+

×

,
=8

,
=8

;
(99)(21+

)÷

=21×

+

×

,
=15+

,
=15

;
(100)

×

+

×

=(


)×

,
=1×

,
=

;
(101)

÷

+

÷

=(


)×

,
=4×

,
=17;
(102)(

-

)÷

=

×

-

,
=

,
=

;
(103)

×

+

=


,
=

;
(104)

-

×

-

=

-


,
=

-(


),
=

-1,
=

;
(105)

-(

÷

+

)
=

-

-

,
=1-

,
=

;
(106)

+

×

+

=

+(


),
=

+1,
=1

;
(107)1-

÷

-

=1-(

),
=1-1,
=0;
(108)

×

+

÷4
=(


)×

,
=1×

,
=

;
(109)5-(4+

)
=5-4-

,
=1-

,
=

;
(110)1125-997
=1125-1000+3,
=125+3,
=128;
(111)7.46-0.83-2.17
=7.46-(0.83+2.17),
=7.46-3,
=4.46;
(112)12.85-1.17-8.83+1.15
=(12.85+1.15)-(1.17+8.83),
=14-10,
=4;
(113)4.5×102
=4.5×(100+2),
=4.5×100+4.5×2,
=450+9,
=459;
(114)0.4×6.3×25
=0.4×25×6.3,
=10×6.3,
=63;
(115)(4.9+4.9+…+4.9)×2.5(16個(gè)4.9相加)
=4.9×16×2.5,
=4.9×(4×2.5×4),
=4.9×40,
=196;
(116)7.5×199
=7.5×(200-1),
=7.5×200-7.5×1,
=1500-7.5,
=1492.5;
(117)(

+

)×36
=

×36,
=4+3,
=7;
(118)1.2×5.7-1.2+5.3×1.2
=(5.7+5.3-1)×1.2,
=10×1.2,
=12;
(119)0.825×102-82.5
=0.825×102-0.825×100,
=0.825×(102-100),
=0.825×2,
=1.65;
(120)46×

=

;
(121)560÷16÷5
=560÷(16×5),
=560÷80,
=7;
(122)3÷2.5,
=1.2;
(123)84+(54-16)
=84+38,
=122;
(124)

+

+

+

=(

+

)+(

+

),
=1+1,
=2;
(125)

-(

÷

+

)
=

-

-

,
=1-

,
=

;
(126)3×(

+

)+

=3×

,
=(

)

,
=1+

,
=1

;
(127)7.2÷(5-0.75+0.25)
=7.2÷4.5,
=1.6;
(128)725÷25+275÷25
=(725+275)÷25,
=1000÷25,
=40;
(129)

×

×

=

×

×

,
=

,
=

;
(130)

×45-

÷

=

×45-

×45,
=0;
(131)48×(

-

)
=48×

,
=40-18,
=22;
(132)

×

+

×

=

,
=

;
(133)(32+

)÷4
=32×

,
=8+

,
=8

;
(134)

÷

÷

=

,
=1;
(135)46×

,
=(45+1)×

,
=45×

+

;
=2

;
(136)

×

+

÷9
=(

)×

,
=1×

,
=

.
分析:本題按照先算乘除再算加減,有括號(hào)的先算括號(hào)里面的順序運(yùn)算.注意觀察算式的特點(diǎn),能運(yùn)用運(yùn)算定律簡算,或者其它簡便方法簡算的要簡算.
點(diǎn)評:本題是考察的基本運(yùn)算法則,根據(jù)運(yùn)算順序計(jì)算.本題有很多可以簡算,用相關(guān)的運(yùn)算定律簡算.