算几道题1. (x-3y)(2x+y)2. (3a-2)(a-1)-(a+1)(a+2)3. 3a(a-1)-2(a-2
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算几道题
1. (x-3y)(2x+y)
2. (3a-2)(a-1)-(a+1)(a+2)
3. 3a(a-1)-2(a-2)(a+3)
快,我现在就要,做多呆到11:00
能不能写下过程
1. (x-3y)(2x+y)
2. (3a-2)(a-1)-(a+1)(a+2)
3. 3a(a-1)-2(a-2)(a+3)
快,我现在就要,做多呆到11:00
能不能写下过程
(1)(x-3y)(2x+y)
=2x²+xy-6xy-3y²
=2x²-5xy-3y²
(2)(3a-2)(a-1)-(a+1)(a+2)
=3a²-3a-2a+2-(a²+2a+a+2)
=3a²-3a-2a+2-a²-2a-a-2
=a²-8a
(3)3a(a-1)-2(a-2)(a+3)
=3a²-3a-2(a²+3a-2a-6)
=3a²-3a-2a²-6a+4a+12
=a²-5a+12
=2x²+xy-6xy-3y²
=2x²-5xy-3y²
(2)(3a-2)(a-1)-(a+1)(a+2)
=3a²-3a-2a+2-(a²+2a+a+2)
=3a²-3a-2a+2-a²-2a-a-2
=a²-8a
(3)3a(a-1)-2(a-2)(a+3)
=3a²-3a-2(a²+3a-2a-6)
=3a²-3a-2a²-6a+4a+12
=a²-5a+12
算几道题1. (x-3y)(2x+y)2. (3a-2)(a-1)-(a+1)(a+2)3. 3a(a-1)-2(a-2
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