JCL7(6)700*800Y1800*400*250

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JCL7(6)700*800Y1800*400*250
1.5y+8y-6y=2y-3

移项、得1.5y=-3系数化为一、y=-2很简单的呀

1- 6y+y²

1-6y+y²=9-6y+y²-8=3²-6y+y²-8=(3-y)²-8再问:“9和8”是哪里来的?再答:把1拆开来写,因为9-8=1,这样式子9-

6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5

设x-y=mx+y=n则6m-2n=143m+n=5解得m=2n=-1即x-y=2x+y=-1解得x=1/2y=-3/2

x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20

由(1)得3x+3y+2x-2y=365x+y=36(3)由(2)得4x+4y-3x+3y=-20x+7y=-20(4)(3)×7-(4)得34x=272∴x=8把x=8代入(3)得y=-4∴x=8y

2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方

2(y-x)²-7(x-y)+6(x-y)-3(y-x)²=-(y-x)²-(x-y)=-(x-y)²-(x-y)=-(x-y)[(x-y)+1]=(y-x)(

1-6y+y² 分解因式

1-6y+y²=y²-6y+9-8=﹙y-3﹚²-8=﹙y-3-2√2﹚﹙y-3+2√2﹚.

解分式方程6y+12/y^2+4y+4 -y^2-4/y^2-4y+4 +y^2/y^2-4=0

6y+12/y^2+4y+4-y^2-4/y^2-4y+4+y^2/y^2-4=0没有说明分母是那个分子是那个这样子很混乱建议加括号扩住分子分母再问:我现在加了括号再答:解6(Y+2)/(Y+2)^2

10(8-y)+6y=56

80-10y+6y=5680-56=10y-6y24=4yy=6

计算:(x-y)^2*(y-x)^2*(x-y)^6

(x-y)^2*(y-x)^2*(x-y)^6=(x-y)^2*(x-y)^2*(x-y)^6=(x-y)^10再问:能详细一点吗?我,初一的再答:(x-y)^2=(y-x)^2=(x-y)^2*(x

(x-y)³+9(x-y)-6(x-y)²

原式=(x-y)[(x-y)^2-6(x-y)+9]=(x-y)(x-y-3)^2很高兴为您解答,祝你学习进步!不懂可追问!

求y最小值 y=6x+800/(3x+5)

均值不等式有三个注意的地方,1,正:就是要用时,必须满足都为正数.2,定:就是在用均值不等式后的结果一定是个常数,不含有变量.3,相等:在满足1,2时,令那两个数相等解得x就为取得最值时的值.你那道题

(x-y)x^6+(y-x)y^6因式分解

(x-y)x^6+(y-x)y^6=(x-y)x^6-(x-y)y^6=(x-y)(x^6-y^6)=(x-y)(x³+y³)(x³-y³)=(x-y)(x+y

6(x+y)2-2(x-y)(x+y)因式分解

(x+y)ˆ2-2(x+y)(x-y)+(x-y)ˆ2=(x+y-x+y)^2=(2y)^4=4y^2如果满意请点击右上角评价点【满意】即可~再问:这个我看不懂,能不能写下来啊,谢

(x+y)²+x+y-6因式分解

原式=(x+y)²+(x+y)-6=(x+y+3)(x+y-2)

0.7x+0.5y=8.5,10%x+6%y=8.5%*800 解方程.

0.7x+0.5y=8.57x+5y=85(1)10%x+6%y=8.5%*8000.1x+0.06y=68简便乘707x+4.2y=4760(2)(1)-(2)0.8y=-4675所以y=-2337

先化简,在求值:6y-(y+2分之y + 2-y分之y)除以y³-4y-2y²+8分之y,其中y=

6y-(y+2分之y+2-y分之y)除以y³-4y-2y²+8分之y=6y-[(2y-y²+2y+y²)/(4-y²)]÷y/(y-2)³=

1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(

1.((y+2x)(-2x+y)+4(x+2y)^2)/3y=(y^2-4x^2+4x^2+16xy+16y^2)/3y=(17y^2+16xy)/3y=17y/3+16x/32.(2(x-y)^3-

2.5y+10y-6y=15-21.5

2.5y+10y-6y=15-21.56.5y=-6.5y=-6.5÷6.5y=-1