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55✘48怎样列竖式计算

=1.25✘0.8✘7 =1✘7 =7 就是 5.6=0.8✘7

60✘2=120 120✘2=240

5✘3✘3✘3✘13

=1✘99+99✘99 =99✘(1+99) =99✘100 =9900

(a+0.3)*1.2- a+0.3*1.2=0.38 0.2a=0.38 a=1.9 a是1.9。

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