(1)3xy∧2-3[xy-2(xy-1/2xy∧2)+2xy],其中x=-2,y=1
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/07/17 07:17:35
(1)3xy∧2-3[xy-2(xy-1/2xy∧2)+2xy],其中x=-2,y=1
(2)已知A=-x∧2+3x-1,B=-2x∧ 2+x+1,计算当x=-2时,2A-B的值.先化简再求值
(2)已知A=-x∧2+3x-1,B=-2x∧ 2+x+1,计算当x=-2时,2A-B的值.先化简再求值
解3xy∧2-3[xy-2(xy-1/2xy∧2)+2xy],
=3xy∧2-3[xy-2xy+1xy∧2+2xy],
=3xy∧2-3xy+6xy-3xy∧2-6xy,
=-3xy
=-3*(-2)*1
=6
A=-x∧2+3x-1,B=-2x∧ 2+x+1
2A-B
=2(-x∧2+3x-1)-(-2x∧ 2+x+1)
=-2x∧2+6x-2+2x∧ 2-x-1
=5x-3
=5*(-2)-3
=-13
=3xy∧2-3[xy-2xy+1xy∧2+2xy],
=3xy∧2-3xy+6xy-3xy∧2-6xy,
=-3xy
=-3*(-2)*1
=6
A=-x∧2+3x-1,B=-2x∧ 2+x+1
2A-B
=2(-x∧2+3x-1)-(-2x∧ 2+x+1)
=-2x∧2+6x-2+2x∧ 2-x-1
=5x-3
=5*(-2)-3
=-13
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
(x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2
当x=3,y=3分之1时,求代数出3xy-[2xy-2(xy-2分之3xy)+xy]+3xy的值
(x+2y-3xy+2x+y-xy)-(-2-y+xy),其中x+y=2分之1,xy=-2分之1
(8xy-3x平方)-5xy-2(3xy-2x平方),其中,x=2,y=-1
[(xy-2)(-xy-2)-4(xy-1)^2]除以(-xy),其中x=20,y=-25分之1
3x^2y-[2xy^2-4(1/2xy-3/4x^2y)+xy]+3xy^2,其中x=3,y=-1/3
化简求值3x²y-[2xy-2(xy-3/2x²y)+xy]+3xy²其中x=3、y=-1
3(xy-xy)-2(xy+xy)+3xy
化简求值:【4(xy-1)²-(xy+2)(2-xy)】÷¼xy,其中x=-3,y=1/5
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
已知 (x+1)² +|y-1|=0,求 2(xy-xy²)-(3xy²-xy) 的值.