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99.99乘0.8加11.11乘2.8的简便运算

99.99X0.8+11.11X2.8 =11.11X9X0.8+11.11X2.8 =11.1...

=11.11*(7.2+2.8) =111.1

99.99*0.8+11.11*2.8 =11.11*(9*0.8)+11.11*2.8 =11...

=11.11*7.2+11.11*2.8=11.11*10=111.1

=11.1x7.2+11.1x2.8 =11.1x(7.2+28) =11.1x10=111

解答过程如下: 99×11 =(100-1)×11 =100×11-11 =1100-11 =108...

(1)99.99X0.8+11.11X2.8=99.99X0.8+11.11X2+11.11X0.8...

原式=11.11×9.9+11.11×0.1 =11.11×(9.9+0.1) =11.11×10 ...

99.99×0.7+11.11×3.7 =11.11x9x0.7+11.11x3.7 =11.1...

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