答案4x²y 2xy-12xy²
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解原式=5x2-[2xy-xy-6+4x2]=5x2-xy+6-4x2=x2-xy+6
2x^2+xy-y^2-4x+5y-6=(2x-y)(x+y)-4x+5y-6=(2x-y)(x+y)+(2x+2y)-6x+3y-6=(2x-y)(x+y)+2(x+y)-6x+3y-6=(x+y)
解|x+2|+|y-3|=0∴x+2=0,y-3=0∴x=-2,y=3∴-1/2x+5/3y+4xy=-1/2×(-2)+5/3×3+4×(-2)×3=1+5-24=-18
解题思路:本题主要利用完全平方公式进行因式分解即可求出结果解题过程:解:x²-6xy+9y²=(x-3y)2
xy^2-4x=x(y+2)(y-2)-2a^2+4ab-2b^2=-(a-b)^2a^2(x-y)+b^2(y-x)=(x-y)(a+b)(a-b)(a^2+b^2)^2-4a^2b^2=(a+b)
(4xy+12y)+(7x-(3xy+4Y-x))=4xy+12y+(7x-3xy-4y+x)=4xy+12y+7x-3xy-4y+x=(4-3)xy+(12-4)y+(7+1)x=xy+8y+8x当
xy-12=4x+y≥2√(4xy)=4√(xy)xy-4√(xy)-12≥0(√(xy)-6)(√(xy)+2)≥0√(xy)≤-2,√(xy)≥6因为√(xy)≥0所以√(xy)≥6xy≥36所以
18(4x²-xy)-19(4x²-xy)+(4x²-xy-1)=72x²-18xy-76x²+19xy+4x²-xy-1=-4x²
(-3x^y+2xy)-(4x^+xy)=-3x^y+2xy-4x^-xy=-3x^y+xy-4x^所以填上-3x^y+xy-4x^
解题思路:将原方程右边分解因式为(x-4y)(x+y)=0,可得x=4y或x=-y,进而可求出x与y的比值。解题过程:解:∵x2-3xy-4y2=0∴(x-4y)(x+y)=0∴x=4y或x=-y∵x
-3(2x²-xy)+4(x²+xy-6)=6x²+3xy+4x²+4xy-24=-2x²+7xy-24
3x²+2x²-3x-(-x+5x²)=3x²+2x²-3x+x-5x²=-2x其中x=314时,-2x=-2*314=-6285xy-8x
3x²y+{xy-[3x²y-(4xy²+1/2xy)]-(4x²y+3/2xy)}=3x²y+xy-3x²y+4xy²+1/2x
结果=X+5Y再问:过程?谢谢再答:分别把它们因式分解,然后就能抵消了。。。
(4xy+12y)+[7x-(3xy+4y-x)]=4xy+12y+7x-3xy-4y+x=xy+8x+8y=xy+8(x+y)=(-2)+8*3=-2+24=22
-3(2x^2-xy)+4(x^2+xy-6)=-6x^2+3xy+4x^2+4xy-24=-2x^2+7xy-24再问:thankyou~
解题思路::∵x+y=0,x+13y=1,解得x=1/12,y=-1/12∴x²+12xy+13y²=1/144-1/12+13/144=14/144-1/12=2/144=1/72解题过程:已知x+
只能提取公因式-16x²y²+12xy³z-4xy=-4xy(4xy+3y²z+1)再问:因式分解3a²-6a+3谢谢再答:=3(a²-2a
解题思路:先用十字相乘法、再运用平方差公式可解。解题过程:同学:另两道题目,我一时间没能解答出来,请你再检查一下原题。很抱歉,请你原谅!
化简的结果是xy(x-2y)再问:过程?!再答:过程太麻烦了,电脑没法打。