考點:分?jǐn)?shù)的加法和減法,整數(shù)的加法和減法,整數(shù)的乘法及應(yīng)用,小數(shù)的加法和減法,小數(shù)乘法,小數(shù)除法
專題:計算題
分析:根據(jù)分?jǐn)?shù)、小數(shù)四則運(yùn)算的計算法則進(jìn)行口算即可,7×1.3+7×6.7利用乘法分配律簡算,
+
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利用加法結(jié)合律簡算.
解答:
解:
+= | 7.2÷0.3=24 | -1= | 48+39=87 |
+= | 1-= | 1-0.98=0.02 | 25×12=300 |
5-0.05=4.95 | +=1.2 | 1.6×0.5=0.8 | 5.4÷0.9=6 |
-=0.25 | -= | 2.5×4=10 | 4.3-1.9=2.4 |
7.2÷6=1.2 | += | 500-68=432 | +=1 |
1+=1 | 1.4-=1 | 1-=0.2 | -= |
5×1.2=6 | 8.5-5=3.5 | 8.4÷4=2.1 | 37+63=100 |
7.2+2.8=10 | 3.99+0.01=4 | -= | 2+=2 |
-= | 2.4+0.06=2.46 | -= | +=1 |
+0.2=1 | -=0.5 | -= | -= |
0.54÷9=0.06 | 1÷0.25=4 | 0.38×2=0.76 | -=0 |
+= | += | 8.1÷0.09=90 | 2-=1 |
2.5×0.6=1.5 | 0.67+0.3=0.97 | 12×0.5=6 | 3.2+1.8=5 |
0.87-0.5=0.37 | 1.2÷0.3=4 | -=0.5 | +=1 |
-= | 7×1.3+7×6.7=56 | ++=1.6 | 0.8×25-10=10 |
點評:此題考查了分?jǐn)?shù)、小數(shù)四則運(yùn)算的計算法則的運(yùn)用,計算量較大,要細(xì)心.