(-2xy∧2)∧3·(-3x∧2y∧3)∧2·1/4xy=?
(-1/3xy)∧2*[3xy(2x-y)-3x(2xy-4y∧2)]
4x∧2y-[6xy-3(4xy-2)+4x∧2y]+1
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
(-3x^y+2xy)-( )=4x^+xy
已知x-y=4xy,则2x+3xy-2yx-2xy-y
化简&因式分解化简:898*902+4因式分解:1)x∧2+2xy+y∧2-x-y2)3x∧2y-6xy+3y
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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