考點(diǎn):小數(shù)的加法和減法,運(yùn)算定律與簡(jiǎn)便運(yùn)算,分?jǐn)?shù)乘法,分?jǐn)?shù)除法,分?jǐn)?shù)的四則混合運(yùn)算,小數(shù)乘法,小數(shù)除法,小數(shù)四則混合運(yùn)算,百分?jǐn)?shù)的加減乘除運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡(jiǎn)算
分析:根據(jù)四則運(yùn)算的計(jì)算法則計(jì)算即可求解.注意1.25×3×8變形為1.25×8×3計(jì)算,0.99+99×0.99根據(jù)乘法分配律計(jì)算,0.47+3.86+0.53變形為0.47+0.53+3.86計(jì)算.
解答:
解:
3.4-1.4=2 |
390×0.02=7.8 |
18÷36=0.5 |
0.37+1.6=1.97 |
0.125×8=1 |
4×(0.6+1.9)=10 |
1÷= |
×= |
1.25×3×8=30 |
0.99+99×0.99=99 |
1+20%=1.2 |
121×-70=7 |
100×25%=25 |
÷= |
0.47+3.86+0.53=4.86 |
點(diǎn)評(píng):考查了四則運(yùn)算,關(guān)鍵是熟練掌握計(jì)算法則正確進(jìn)行計(jì)算.