作业帮x^2-4xy 5y^2-12y 14的最小值
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/22 13:18:09
原式=[x2+y2+2xy-x2-y2+2xy-2xy+y2]÷4y=（2xy+y2）÷4y=14（2x+y）=14×4=1．
写清楚点点比如说前面是X/X还是X/(X-Y)打上括号分段这样才能清楚的做
(x-y)(z+y-x+y+2y)÷4y=(x-y)(z-x+4y)÷4y{(x+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y=(x-y)(x+y-x+y+2y)÷4y=(x-y)(4
2x-y/x+3y=2得x+3y/2x-y=1/24x-2y/x+3y减4x+12y除以2x-y=2(2x-y)/x+3y-4(x+3y)/2x-y=2乘以2-4乖以1/2=4-2=2
4-12(x-y)+9(x+y)^2=[3(x+y)]^2-12xy+2^2=[3(x+y)-2]^2=(3x+3y-2)^2
(x^2-y^2)/(x+y)-(4x(x-y)+y^2)/(2x-y)=(x-y)(x+y)/(x+y)-(4x^2-4xy+y^2)/(2x-y)=(x-y)-(2x-y)^2/(2x-y)=(x
答案是2.4x-2y/x+3y=(2x-y/x+3y)乘以2=4,4x+12y/2x-y=(x+3y/2x-y)乘以4=1/2x4=2,所以代数式等于4-2=2.
∵x²+y²-4x+2y+5=0x²-4x+4+y²+2y+1=0(x-2)²+(y+1)²=0x-2=0y+1=0∴x=2y=-14x&#
(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90)=x-2x-3x-4x-..-10x+y*(1-1/2-1/6-1/12-..1/90
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(x-y)^2+12(x-y)+36=(x-y+6)²;很高兴为您解答,skyhunter002为您答疑解惑如果本题有什么不明白可以追问,再问：Guoc过程再答：(x-y)^2+12(x-y
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原式等于2x^2-xy+6xy-3y^2-8x+4y=2x^2+5xy-3y^2-8x+4y