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:①②④運(yùn)用乘法的分配律進(jìn)行計(jì)算.
③運(yùn)用加法的結(jié)合律、交換律進(jìn)行計(jì)算即可.
⑤先計(jì)算括號里面的,再計(jì)算括號外面的除法及加法.
解答:
解:①7.6×5.2+7.6×4.8+3.6
=7.6×(5.2+4.8)+3.6
=76+3.6
=79.6
②0.59×
+0.21×25%+0.2×0.25
=0.59×0.25+0.21×0.25+0.2×0.25
=0.25×(0.59+0.21+0.2)
=0.25×1
=0.25
③
+
+
+
×3
=
+
+
+
+
+=(
+
)+(
+)+(
+
)
=10+100+1000
=1110
④85÷4+26×
+0.5
=85×
+26×
+2×
=(85+26+2)×
=113×
=28.25
⑤
+0.25÷(
-1.5×
)
=
+
÷(
-
×
)
=
+÷
=
=2
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)算律簡便計(jì)算