分析:(1)(8)(9)根據(jù)小數(shù)減的計(jì)算方法計(jì)算,
(2)從左到右依次計(jì)算,
(3)先把百分?jǐn)?shù)化成小數(shù),再根據(jù)小數(shù)加法的計(jì)算方法計(jì)算,
(4)根據(jù)小數(shù)乘法的計(jì)算方法計(jì)算,
(5)先算括號(hào)里面的,再算括號(hào)外面的,
(6)根據(jù)乘法分配律進(jìn)行計(jì)算,
(9)用比的前項(xiàng)除以比的后項(xiàng).
(10)先把除法化成乘法,再根據(jù)乘法交換律和結(jié)合律進(jìn)行計(jì)算,
(11)先算平方,再算減法,
(12)把小數(shù)化成分?jǐn)?shù),再根據(jù)分?jǐn)?shù)除法的計(jì)算方法計(jì)算.
解答:
解:(1)2.98-0.98=2 |
(2)5×4×0.25=5 |
(3)2+1%=2.01 |
(4)4.8×=1.2 |
(5)-(-)= |
(6)9×0.35+0.35=3.5 |
(7)4.1-4.01=0.09 |
(8)1.2萬-0.8萬=0.4萬 |
(9):125%= |
(10)×÷×= |
(11)0.42-0.22=0.12 |
(12)÷0.35= |
點(diǎn)評(píng):本題綜合考查了學(xué)生的計(jì)算能力,注意要細(xì)心.