考點(diǎn):分?jǐn)?shù)的四則混合運(yùn)算,運(yùn)算定律與簡便運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡算
分析:(1)根據(jù)乘法結(jié)合律進(jìn)行簡算;
(2)根據(jù)減法的性質(zhì)進(jìn)行簡算;
(3)先算減法,再按照從左向右的順序進(jìn)行計(jì)算;
(4)先算除法,再算加法;
(5)根據(jù)乘法分配律進(jìn)行簡算;
(6)根據(jù)乘法分配律進(jìn)行簡算.
解答:
解:(1)0.125×(8×0.8)
=(0.125×8)×0.8
=1×0.8
=0.8;
(2)9.43-(2.43+0.39)
=9.43-2.43-0.39
=7-0.39
=6.61;
(3)(
-
)÷
÷
=
÷
÷
=
÷
=
;
(4)
÷6+6÷
=
+36
=36
;
(5)
×
+
÷4
=
×
+
×
=
×(
+
)
=
×1
=
;
(6)(
+
-
)×36
=
×36+
×36-
×36
=16+30-14
=46-14
=32.
點(diǎn)評:考查了運(yùn)算定律與簡便運(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)算定律簡便計(jì)算.