工厂配电房解读:请问b+3a=ab怎么变成(a-1)(b-3)=3?
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左边移到右边0=ab-3a-b
左右同时加3,3=ab-3a-b+3=a(b-3)-(b-3)=(a-1)(b-3)
(a - 1)(b - 3) - 3
= (ab - 3a - b + 3) - 3
= ab - (3a + b)
= 0
3a + b = ab
ab - (3a + b) = 0
ab - 3a - b + 3 = 3
(a - 1)(b - 3) = 3
b+3a=ab 0=ab-3a-b 0=a(b-3)-(b-3)-3
(b-3)(a-1)=3