0.68*9简便计算

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0.68*9简便计算

0.68*9简便计算
0.68*9简便计算

0.68*9简便计算
0.68*9
=0.68*(10-1)
=0.68*10-0.68
=6.8-0.68
=6.12

=0.68*(10-1)
=0.68*10-0.68*1
=6.8-0.68
=6.12

0.68*9
=0.68*(10-1)
=6.8-0.68
=6.12