考點(diǎn):分?jǐn)?shù)的加法和減法,整數(shù)的乘法及應(yīng)用,小數(shù)乘法,小數(shù)除法
專題:運(yùn)算順序及法則
分析:橫向數(shù):
(1)(2)(3)(4)(7)(8)(9)依據(jù)分?jǐn)?shù)加減法計(jì)算方法計(jì)算,
(5)運(yùn)用加法交換律解答,
(6)按照先算括號(hào)里面的,再算括號(hào)外面的順序計(jì)算解答,
(10)按照從左到右順序計(jì)算解答,
(11)(12)(13)(14)(15)(17)依據(jù)小數(shù)四則運(yùn)算計(jì)算方法解答,
(16)(18)(19)(20)依據(jù)整數(shù)除法計(jì)算方法解答.
解答:
解:+=1 | 2+=2 | 3-=2 | -= | +-= |
7.5-(2.5+3.8)=1.2 | +=1 | += | -= | 2--=1 |
0.51÷17=0.03 | 32.8+19=51.8 | 5.2÷1.3=4 | 1.6×0.4=0.64 | 4.9×0.7=3.46 |
1÷5=0.2 | 0.87-0.49=0.38 | 123+25=148 | 56×7=392 | 135÷5=27 |
點(diǎn)評(píng):本題主要考查學(xué)生運(yùn)用四則運(yùn)算計(jì)算方法正確進(jìn)行計(jì)算的能力,關(guān)鍵是計(jì)算結(jié)果要準(zhǔn)確.