Question

2.22*9.9+6.66*6.7咋么简便计算？？？

Answer 1

2.22*9.9分解成2.22*3*3.3=6.66*3.3再提公因式

2.22*9.9+6.66*6.7

=6.66×3.3+6.66×6.7
=6.66×（3.3+6.7）
=66.6
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Answer 2

先提取2.22，变成2.22*（9.9+6.7*3)
再提取3，变成6.66*（3.3+6.7）=6.66*10=66.6
OK,够简便了吧

Answer 3

2.22*9.9+6.66*6.7
=6.66*3.3+6.66*6.7

=6.66*（3.3+6.7）
=66.6

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Answer 4

原式=1.11*2*1.1*9+1.11*6*(1.1*6+0.1)
=1.11*1.1*18+1.11*1.1*36+1.11*0.6
=1.11*1.1*54+1.11*0.6
=1.11*(1.1*54+0.6)
=1.11*60
=66.6