分析:(1)(2)根據(jù)整數(shù)加減法的計(jì)算法則進(jìn)行計(jì)算;
(3)根據(jù)小數(shù)乘法的計(jì)算法則進(jìn)行計(jì)算;
(4)根據(jù)分?jǐn)?shù)減法的計(jì)算法則進(jìn)行計(jì)算;
(5)根據(jù)分?jǐn)?shù)除法的計(jì)算法則進(jìn)行計(jì)算;
(6)根據(jù)四則混合運(yùn)算的計(jì)算順序進(jìn)行計(jì)算;
(7)把百分?jǐn)?shù)化成小數(shù),再根據(jù)小數(shù)乘法的計(jì)算法則進(jìn)行計(jì)算;
(8)(10)根據(jù)分?jǐn)?shù)乘法的計(jì)算法則進(jìn)行計(jì)算;
(9)根據(jù)加法結(jié)合律和加法交換律進(jìn)行計(jì)算;
(11)根據(jù)乘法分配律進(jìn)行計(jì)算;
(12)根據(jù)小數(shù)除法的計(jì)算法則進(jìn)行計(jì)算.
解答:
解:(1)38+45=83 |
(2)920-350=570 |
(3)0.5×0.2=0.1 |
(4)-= |
(5)1÷÷= |
(6)×(-80%)=0 |
(7)16×25%=4 |
(8)×= |
(9)+-+=1 |
(10)×3.6=3 |
(11)0.99×9+0.99=9.9 |
(12)12.6÷3=4.2 |
點(diǎn)評(píng):本題綜合考查了學(xué)生基本的計(jì)算能力,以及在計(jì)算中能力靈活運(yùn)用簡(jiǎn)便算法的能力.