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62乘51减62的简便运算

138x51一138 二138X(51一1) 二138Ⅹ50 二690O

(51+49)*11 =100*11 =1100 直接算就很简便了。

2.6*7.4+0.26*51+26*0.02 =2.6*7.4+2.6*5.1+2.6*0.2 =2.6*(7.4+5.1+0.2) =2.6*12.7 =33.02

51x208 =51x200+51x8 =10200+408 =10608

72+28×51-31 =72+28×(50+1)-31 =72+28+28×50-31 =(72+28)+28×50-31 =100+1400-31 =1500-31 =1469 解析:先将51拆分额50和1,得到的28和72即可凑成100,28与50相乘的运算也非常简单,然后依次运算即可。

51x(9/10)-6/0.9 =51x(9/10)-6x(9/10) =(51-6)x(9/10) =45x(9/10) =40.5

原式 =12x140x51 =12x140x(50+1) =12x50x140+12x140x1 =600x140+12x140 =84000+1680 =85680 供参考。

39×48+39+39×51 =39×(48+1+51) =39×100 =3900

51 乘以480加48乘500 =510*48+48*500 =48*1010 =48*(1000+10) =48000+480 =48480

65乘48加65乘51加65简便运算 =65x(48+51+1) =65x100 =6500

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