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,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(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先算除法,再根據(jù)減法的性質(zhì)進(jìn)行簡(jiǎn)算;
④根據(jù)乘法分配律進(jìn)行簡(jiǎn)算.
解答:
解:①3.5+3.5×99
=3.5×(1+99)
=3.5×100
=350;
②
×0.53+75%×1.47
=0.75×0.53+0.75×1.47
=0.75×(0.53+1.47)
=0.75×2
=1.5;
③3-
÷
-
=3-
-
=3-(
+
)
=3-2
=1;
④36×
+64÷3
=36×
+64×
=(36+64)×
=100×
=32.
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.