1.3xy-4xy-(-2xy)

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/15 04:47:50

1.3xy-4xy-(-2xy)
2.- 1/3 ab- 1/4 a²+ 1/3 a²-(-2/3ab)
3.(-x+2x²+5)+(4x²-3-6x)
4.(3a²-ab-+7)-(-4a²+2ab+7)

1.3xy-4xy-(-2xy)=-xy+2xy=xy
2.- 1/3 ab- 1/4 a²+ 1/3 a²-(-2/3ab)
=1/3 a²-1/4a²-1/3ab+2/3ab
=1/12a²+1/3ab
3.(-x+2x²+5)+(4x²-3-6x)
=2x²-x+5+4x²-6x-3
=6x²-7x+2
4.(3a²-ab+7)-(-4a²+2ab+7)
=3a²-ab+7+4a²-2ab-7
=7a²-3a

xy^2-2xy+2y-4 3xy-3xy-xy+2yx 【（2+xy）（xy-2）-xy（xy+1）+4】/（-2xy）一道计算题! 先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1 3(xy－xy)－2(xy＋xy)＋3xy -3(2x^2-xy)+4(x^2+xy-6) 因式分解xy²-2xy+2y-4 分解因式.xy²-2xy+2y-4 将xy^-2xy+2y-4因式分解（-3x^y+2xy)-( )=4x^+xy -3(2x²-xy)+4(x²+xy-6) xy^2-4x 因式分解