数学已知A=5x的平方y-3xy平方+4xy,B=7xy平方-2xy+x平方y,若A+B+2C=0化简C-A
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数学已知A=5x的平方y-3xy平方+4xy,B=7xy平方-2xy+x平方y,若A+B+2C=0化简C-A
数学已知A=5x的平方y-3xy平方+4xy,B=7xy平方-2xy+x平方y,若A+B+2C=0化简C-A
数学已知A=5x的平方y-3xy平方+4xy,B=7xy平方-2xy+x平方y,若A+B+2C=0化简C-A
A=5x^2y-3xy^2+4xy
B=7xy^2-2xy+x^2y
2C=-A-B
2C-2A=-3A-B=-15x^2y+9xy^2-12xy-7xy^2+2xy-x^2y=-16x^2y+2xy^2-10xy
C-A=-8x^2y+xy^2-5xy
C-A-------------------------A+B+2C=0,所以,C=-1/2(A+B)
=-1/2(A+B)-A
=-1/2(B+3A)
=1/2(-15x^2y+9xy^2-12xy-7xy^2+2xy-x^2y)
=1/2(-16x^2y+2xy^2-10xy)
=-8x^2y+xy^2-5xy
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C-A-------------------------A+B+2C=0,所以,C=-1/2(A+B)
=-1/2(A+B)-A
=-1/2(B+3A)
=1/2(-15x^2y+9xy^2-12xy-7xy^2+2xy-x^2y)
=1/2(-16x^2y+2xy^2-10xy)
=-8x^2y+xy^2-5xy
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