0.99+9.9*9.9-900%=

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0.99+9.9*9.9-900%=0.99+9.9*9.9-900%=0.99+9.9*9.9-900%=原式=0.99+9.9×9.9-9=9.9×(0.1+9.9)-9=99-9=90=0.99

0.99+9.9*9.9-900%=
0.99+9.9*9.9-900%=

0.99+9.9*9.9-900%=
原式
=0.99+9.9×9.9-9
=9.9×(0.1+9.9)-9
=99-9
=90

=0.99*1+0.99*99-9 =0.99*(1+99)-9 =99-9 =90

90

90

0.99 + 9.9 × 9.9 - 900%
= (1 - 0.01)+ 9.9 × (10 - 0.1)- 9
= 1 - 0.01 + 9.9 × 10 - 9.9 × 0.1 - 9
= 1 - 0.01 + 99 - 0.99 - 9
= (1 + 99)- (0.01 + 0.99)- 9
= 100 - 1 - 9
= 100 - 10
= 90

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