9.9*9.9+1.99简便运算

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9.9*9.9+1.99简便运算
9.9*9.9+1.99简便运算

9.9*9.9+1.99简便运算
=(10-0.1)*9.9+1.99
=99-0.99+1.99
=100

9.9*9.9+1.99
=(1-0.1)^2+1.99
=1^2-2*1*0.1+0.1^2+1.99
=1-0.2+0.01+1.99
=0.8+2
=2.8

100

9.9*9.9+1.99 = 9.9*9.9 + 2*9.9*0.1 + 0.1*0.1 = (9.9 + 0.1)*(9.9 + 0.1) = 10*10 = 100

9.9*9.9+1.99简便运算 360.1/9.9简便运算 72×9.9 简便运算 1.98*9.9简便运算 8.5×9.9简便运算 9.9*9.9+1.99=?简便运算 64-9.9简便运算64-9.9=（简便运算） 8.7*9.9简便运算这道题的简便运算方式是 8.7*9.9的简便运算 27.5×9.9+2.75简便运算 25乘9.9 简便运算简便运算47.8*9.9+4.78 1.2×9.9+0.12简便运算 9.9×0.32的简便运算 9.9×1.01的简便运算简便运算：4.5*9.9*0.45 9.9乘以101减9.9 简便运算 3.56*99-3.5*9.9的简便运算