58.7*6.8+6.8*40+6.8简便计算

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58.7*6.8+6.8*40+6.8简便计算
58.7*6.8+6.8*40+6.8简便计算

58.7*6.8+6.8*40+6.8简便计算
58.7*6.8+6.8*40+6.8
=6.8(58.7+40+1)
=6.8*(59+40+1-0.3)
=6.8*(100-0.3)
=680-2.04
=677.96

=6.8×(58.7+40+1)