简便计算 一定要有过程.12 6 × 7⼀12 - 9⼀20 × 6 + 11⼀30 × 6

2024-11-02 06:27:16
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回答(1):

6 × 7/12 - 9/20 × 6 + 11/30 × 6
=6×(7/12-9/20+11/30)
=6×(1/3+1/4-1/4-1/5+1/5+1/6)
=6×(1/3+1/6)
=2+1
=3