装修问答

[(30+20)×2+40×4]÷40=6.5
取整数=7捆.

30+20=50
50*2=100
40*4=160
100+160=260
260/40=6.5

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[(30+20)×2+40×4]÷80约=4（捆）

谁能知道为什么除以40啊？不明白