考點(diǎn):整數(shù)四則混合運(yùn)算,運(yùn)算定律與簡便運(yùn)算,分?jǐn)?shù)的四則混合運(yùn)算,小數(shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡算
分析:(1)先算除法,再算乘法,最后算減法;
(2)根據(jù)乘法分配律進(jìn)行簡算;
(3)先算除法,再算加法,最后算乘法;
(4)先算小括號(hào)里面的加法,再算乘法,最后算括號(hào)外面的加法;
(5)先算除法,再按照減法的性質(zhì)進(jìn)行簡算;
(6)根據(jù)加法交換律和結(jié)合律進(jìn)行簡算.
解答:
解:(1)198-600÷25×4
=198-24×4
=198-96
=102;
(2)51×9.9+5.1
=5.1×99+5.1
=5.1×(99+1)
=5.1×100
=510;
(3)18×(42÷15+8.2)
=18×(2.8+8.2)
=18×11
=198;
(4)6+[(
+
)×
]
=6+[
+
]
=6+
=6
;
(5)10-
-
÷
=10-
-
=10-(
+
)
=10-1
=9;
(6)
+
-(
+
)
=(
-
)+(
-
)
=0+
=
.
點(diǎn)評(píng):此題主要考查分?jǐn)?shù)、整數(shù)、小數(shù)的四則混合運(yùn)算的運(yùn)算順序和應(yīng)用運(yùn)算定律進(jìn)行簡便計(jì)算.