(2a+3b)(3a+4b)(5x+2y)(x-3y)2个答案的要写出来!好的追分!

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(2a+3b)(3a+4b)(5x+2y)(x-3y)2个答案的要写出来!好的追分!
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(2a+3b)(3a+4b)(5x+2y)(x-3y)2个答案的要写出来!好的追分!
(2a+3b)(3a+4b)
(5x+2y)(x-3y)
2个答案的要写出来!好的追分!

(2a+3b)(3a+4b)(5x+2y)(x-3y)2个答案的要写出来!好的追分!
用乘法分配律
(2a+3b)(3a+4b)
=2a(3a+4b)+3b(3a+4b)
=6a²+8ab+9ab+12b²
=6a²+17ab+12b²
(5x+2y)(x-3y)
=5x(x-3y)+2y(x-3y)
=5x²-15xy+2xy-6y²
=5x²-13xy-6y²