(1)A+3B =4x²-4xy+y²+3x²+3xy-15y²=x²-xy-14y²
(2)3A-B=12x²-12xy+3y²-x²-xy+5y²=11x²-13xy+8y²
已知A=4x²-4xy+y²,B=x²+xy-5y²,求:(1)A+3B (
已知A=4x²-4xy+y²,B=x²+xy-5y²,求:(1)A+3B (
已知A=4x²-4xy+y²,B=x²+xy-5y²,求:
(1)A+3B (2)3A-B
急,
已知A=4x²-4xy+y²,B=x²+xy-5y²,求:
(1)A+3B (2)3A-B
急,
数学人气:454 ℃时间:2019-08-19 18:27:33
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