考點(diǎn):分?jǐn)?shù)的四則混合運(yùn)算,運(yùn)算定律與簡(jiǎn)便運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡(jiǎn)算
分析:(1)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(2)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(3)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(4)先算減法,再算除法,最后算乘法;
(5)根據(jù)乘法交換律和結(jié)合律進(jìn)行簡(jiǎn)算.
解答:
解:(1)
×
+
÷6
=
×
+
×
=(
+
)×
=1×
=
;
(2)64×102
=64×(100+2)
=64×100+64×2
=6400+128
=6528;
(3)24×(
-
)
=24×
-24×
=6-4
=2;
(4)1÷(2.1-2.05)×1.5
=1÷0.05×1.5
=20×1.5
=30;
(5)25×32×125
=25×(4×8)×125
=(25×4)×(8×125)
=100×1000
=100000.
點(diǎn)評(píng):考查了運(yùn)算定律與簡(jiǎn)便運(yùn)算,四則混合運(yùn)算.注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律簡(jiǎn)便計(jì)算.