(-2x2y3)2×(xy)3
(6x2y-xy2-1/2x2y3)/(-3xy)原式=6x2y/(-3xy)-xy2/(-3xy)-1/2x2y3/(-3xy)=-2x+y/3+xy2/6哦
初二数学整式的乘法与因式分解（要详细过程0计算：（1）（－2x2y3）²·（xy）³；（2）（2a＋3b）（2a－b）；（3）5x²（x＋1）（x－1）．（4）（2x+y-1)²（5）59.8×60.
伯努利方程(x2y3-xy)dy/dx=1求解我觉得的话(x2y3-xy)dy/dx=1化为(x2y3-xy)dy=dx,即1/4x2dy^4-1/2xdy^2=dx,对两边同时积分,得x=1/4x2y^4-1/2xy^2+c,
(-3xy+2xy)-(4xy+xy)(-3xy+2xy)-(4xy+xy)=-xy-5xy=-6xy-6xy去括号后合并同类项原式=-3xy+2xy-4xy-xy=(-3+2-4-1)xy=-6xy先括号内化简，再去括号相减(-3xy+2
3xy-3xy-xy+2yx3xy-3xy-xy+2yx=-xy+2xy=xy你这全是同类项原试=xy(3-3-1+2)=xy结果为xy。3xy-3xy=0xy=yx2xy-yx=xy（3-3-1+2）xy=xy
3xy-4xy-（-2xy）提公因式xy,用结合律求3xy-4xy-（-2xy）=（3-4+2）xy=xy3xy-4xy-（-2xy）=3xy-4xy+2xy=xy3xy-4xy-（-2xy）=-xy+2xy=xy如果帮到你，请记得采纳，O
3xy-4xy-（-2xy）等于xy
2xy.(-3xy)÷(xy)等于负6.x.y
2xy-xy-(-3xy)=4xy4xy4xy
[(2xy-3)(2xy+3)+(xy+3)^2]/(-xy)=(4X^2Y^2-9+X^2Y^2+6XY+9)/(-XY)=(5X^2Y^2+6XY)/(-XY)=-5XY-6
分解因式：1.a2（x-1）+b2(1-x)2.4x3y3+4x2y3+xy33.3(x-1)2-18(x-1)+271.a2（x-1）+b2(1-x)=a^2(x-1)-b^2(x-1)=(x-1)(a^2-b^2)=(x-1)(a+b)
xy－3xy＋2xy－xy
3xy^2*(-2xy)3xy^2*(-2xy)=-2*3x²y³=-6x²y³
X元素4P轨道3个未成对电子Y元素最外层2p轨道上有两个未成对电子X跟Y可形成化合物X2Y3X,Y是什么元素?X元素4P轨道3个未成对电子也就是说第四周期元素p轨道有3个未成对电子只有可能是第四周期第五（2+3）主族元素AsY元素最外层2p
3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x)3xy(x²-xy²+xy)-xy²(2x²-xy+2x)=3x³y-3x²y³+3x²y&#
3(xy－xy)－2(xy＋xy)＋3xy
1/2xy(2/3xy²-2xy)1/2xy(2/3xy²-2xy)=1/3x²y³-x²y²如果本题有什么不明白可以追问,如果满意请点击“选为满意答案”1/3x²y&#
3(xy-z)^2-(2xy+z)(-z+2xy)
(-4xy^3)×（-xy）+（-3xy^2）^2(-4xy^3)×（-xy）+（-3xy^2）^2=4x^2y^4-3x^2y^4=x^2y^4
（-3xy^2)^2+(-4xy^3)*(-xy)=多少（-3xy^2)^2+(-4xy^3)*(-xy)==9x²y^4+4x²y^4=13x²y^4