6.3×16.9÷0.9÷0.25= 1.25×0.32×2.5=
28.67×67+3.2×286.7+573.4×0.05= 4.83×0.59+0.41×0.59-0.324×5.9=
0.
00…01
2010個(gè)0
×
0.00…0
2010個(gè)0
11=
分析:(1)根據(jù)乘法交換律和結(jié)合律進(jìn)行計(jì)算;
(2)根據(jù)乘法交換律和結(jié)合律進(jìn)行計(jì)算;
(3)根據(jù)乘法分配律進(jìn)行計(jì)算;
(4)根據(jù)乘法分配律進(jìn)行計(jì)算;
(5)0.
00…01
2010個(gè)0
是2010+1=2011位小數(shù),
0.00…0
2010個(gè)0
11是2010-1+2=2011位小數(shù),因?yàn)?×1=1,末尾數(shù)不是0,那么它們的乘積的小數(shù)位數(shù),就是兩個(gè)小數(shù)的位數(shù)和,即2011+2011=4022位小數(shù),又因?yàn)?×11=11,那么小數(shù)部分有4022-2=4010個(gè)0.
解答:解:
(1)6.3×16.9÷0.9÷0.25,
=(6.3÷0.9)×(16.9÷0.25),
=7×67.6,
=473.2;

(2)1.25×0.32×2.5,
=1.25×(0.8×0.4)×2.5,
=(1.25×0.8)×(0.4×2.5),
=1×1,
=1;

(3)28.67×67+3.2×286.7+573.4×0.05,
=286.7×6.7+3.2×286.7+286.7×2×0.05,
=286.7×6.7+3.2×286.7+286.7×0.1,
=286.7×(6.7+3.2+0.1)
=286.7×10,
=2867;

(4)4.83×0.59+0.41×0.59-0.324×5.9,
=4.83×0.59+0.41×0.59-3.24×0.59,
=(4.83+0.41-3.24)×0.59,
=2×0.59,
=1.18;

(5)0.
00…01
2010個(gè)0
×
0.00…0
2010個(gè)0
11,
=0.
00…011
4020個(gè)0
點(diǎn)評(píng):四則運(yùn)算,先弄清運(yùn)算順序,然后再進(jìn)一步計(jì)算,能簡(jiǎn)算的要簡(jiǎn)算.
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科目:小學(xué)數(shù)學(xué) 來(lái)源: 題型:解答題

3.2+4.8=6.3-0.94=0.25×4=5×1.2=
4.8÷0.6=4.8÷24=3.6-2.4=6-4.6=
8-3.4=6×0.21=1.25×8=0.8÷0.5=
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3.2÷4=1.5÷30=5.1÷3=0.37÷0.37=
0.28÷14=0.16÷4=8×0.05=4×0.125=
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2.8÷0.7=21-0.21=5÷0.01=2.8×0=
7÷0.07=6.3÷0.5=0.32÷0.8=1÷0.25=
0.25×0.4=30×2.3=3.6÷1.2=2.5+1.2=
3.5×0.2=9÷0.45=0.96÷0.16=4.8-2.9=
0.5÷0.25=7.6+2.4=0.17×0.4=8.2×0.01=
1.72-0.73=0.46÷2=1.9×0.8=1.2×0.3=
1-0.92=0.16×0.7=0.56÷0.16=8÷0.6=

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