简算9.99*7.78+3.33*6.66简算

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简算9.99*7.78+3.33*6.66简算

简算9.99*7.78+3.33*6.66简算
简算9.99*7.78+3.33*6.66
简算

简算9.99*7.78+3.33*6.66简算
9.99*7.78+3.33*6.66
=9.99*7.78+9.99*2.22
=9.99*(7.78+2.22)
=99.9

3.33*[3*7.78+6.66]=3.33*3*[7.78+2.22]=10*10=100

9.99*7.78+3.33*6.66 =9.99*7.78+3.33*3*2.22=9.99*7.78+9.99*2.22 =9.99*(7.78+2.22)=99.9
OK

9.99*7.78+3.33*6.66
=9.99*7.78+9.99*2.22
=9.99*(7.78+2.22)
=99.9

1楼怎么算成100了?

3.33*[3*7.78+6.66]=3.33*3*[7.78+2.22]=10*10=100
9.99*7.78+3.33*6.66
=9.99*7.78+9.99*2.22
=9.99*(7.78+2.22)
=99.9
9.99*7.78+3.33*6.66 =9.99*7.78+3.33*3*2.22=9.99*7.78+9.99*2.22 =9.99*(7.78+2.22)=99.9