-3(2x^2-xy)+4(x^2+xy-6)
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-3(2x^2-xy)+4(x^2+xy-6)
-3(2x^2-xy)+4(x^2+xy-6)
= - 6x ^2 +3xy +4x^2 + 4xy -24
= - 2x ^2 +7xy -24
再问: thank you~
= - 6x ^2 +3xy +4x^2 + 4xy -24
= - 2x ^2 +7xy -24
再问: thank you~
-3(2x^2-xy)+4(x^2+xy-6)
-3(2x²-xy)+4(x²+xy-6)
(-3x^y+2xy)-( )=4x^+xy
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[3xy(1-x)-6xy(x-1/2)]*2x*(-xy)平方,x=-1 y=2 ; 3xy平方(-1/3x平方y+4
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x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
已知x-y=4xy,则2x+3xy-2yx-2xy-y
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]