考點(diǎn):整數(shù)、分?jǐn)?shù)、小數(shù)、百分?jǐn)?shù)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)乘法分配律進(jìn)行簡算;
(2)先算小括號里面加法,再算除法,最后算括號外面的加法;
(3)根據(jù)乘法分配律進(jìn)行簡算;
(4)根據(jù)乘法分配律進(jìn)行簡算.
解答:
解:(1)5.65×35%﹢7.48×
-3.13×0.35
=5.65×0.35﹢7.48×0.35-3.13×0.35
=(5.65+7.48-3.13)×0.35
=10×0.35
=3.5;
(2)(
+
)÷
+
=
÷
+
=
+
=
;
(3)83×
+2÷
-
=83×
+2×
-
=(83+2-1)×
=84×
=60;
(4)72×(
+
+
)
=72×
+72×
+72×
=66+28+15
=94+15
=109.
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)算定律簡便計算.