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6.7×9.9再加6.1用简便方法怎么算?

2.22×9.9+6.66×6.7 =2.22×3×3.3+6.66×6.7 =6.66×(3.3+6.7) =6.66×10 =66.6

6.7×9.9+0.67×2 =6.7×9.9+6.7×0.2 =6.7×(9.9+0.2) =6.7×10.1 =6.7×(10+0.1) =6.7×10+6.7×0.1 =67+0.67 =67.67

99乘以任何两位数 思维过程: 两数个位相乘6乘以9=54 其中4为个位,5为百位 两数的十位相乘(7+1)乘以9=72 其中7为最高位,2为十位 所以=7524 加上小数点为75.24 此种方法用于99乘以任何两位数哦

9.9*8.8+8.8*7.7+7.7*6.6 =1.1*1.1*(6*7+7*8+8*9) =1.21*(6*7+7*8+8*9) = 1.21*(42+56+72) =1.21*170 =205.7 希望帮到你 望采纳 谢谢 加油~

3.7x9.6+0.63×96 =3.7*9.6+6.3*9.6 =9.6*(3.7+6.3) =9.6*10 =96

7.1×2.6+2.6×2.9 =2.6x(7.1+2.9) =2.6x10 =26 祝天天向上。

(1/7-1/9)乘3/6-2/3 =(9/63-7/63)x1/2-2/3 =2/63x1/2-2/3 =1/63-42/63 =-41/63

题干错误 

8.9*1.1+15.7*8.9+6.8*1.1 =(8.9+6.8)*1.1+15.7*8.9 =15.7*1.1+15.7*8.9 =15.7*(1.1+8.9) =15.7*10 =157 嘎嘎,这样可以了吧,还上小学呢吧,就学会用网络了,厉害!

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