(y-5)² (10-x)²=5²,
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(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=4x-2y-z-5x[6y-(x+y)]+x-(3y-10z)=4x-2y-z-30xy+5x²+5xy+x-3
x-y/7-x+y/10=1/2两边乘7010x-10y-7x-7y=353x-17y=35(1)2(x-y)+5(x+y)=32x-2y+5x+5y=37x+3y=3(2)(2)*3-(1)*79y
(7x-10y)-(-10y-5x)=7x-10y+10y+5x=12x再问:7x-10y+10y+5x似乎等于2x+10y再答:-10y+10y=0
解题思路:根据非负数的行政列出方程求出x,y的值即可求出x²的值解题过程:
[(x+y)²-(x-y)²-2y(x-y)]÷5y=[X²+2XY+Y²-X²+2XY-Y²-2XY+2Y²]÷5Y=[2Y(X
3x+2y=6,5x+6y=10两个式子相加,得8x+8y=16x+y=23x^2-4x+6=12,3x^2-4x=6则x^2-(4x+2)/3=1/3(3x^2-4x-2)=1/3(6-2)=4/3
很多数学符号,还是写出来方便.
十字相乘下.10x+2y=7x+10y3x=7yx/y=7/3
X=2,Y=3或X=3,Y=2
在坐标系中先作2x+5y≥10对应的直线2x+5y=10,取直线上方区域;然后作2x-3y≥-6对应的直线2x-3y=-6,把y的系数变为正,可知取直线下方区域;最后作2x+y≤10对应的直线2x+y
解题思路:对于这种等式一定可以化成平方相加的形式,这里面要使用到完全平方公式。解题过程:
因为(x-y)/(x+y)=3,则(x+y)/(x-y)=1/3则5(x-y)(x+y)-(x+y)/2(x-y)=5*3-1/(3*2)=15-1/6=89/6
2/(x+y)+5/(x-y)=189/(x+y)-10/(y-x)=66设x+y=a,x-y=b,原方程化为2/a+5/b=18-----1(1)9/a+10/b=66-------(2)(2)-(
x+y=0x=-yx/y=y/x=-13x-10+3y+y/5x=3(x+y)-10+y/5x=0-10-1/5=-10.2
另a=1/(x+y),b=1/(x-y);则2a+5b=18;9a+10b=66;解得a=6,b=6/5;即 &nbs
解(x-y)(x+y)-(x-2y)²+x(3x-5y)-(x-y)(x-2y)=(x²-y²)-(x²-4xy+4y²)+(3x²-5xy
(0.2x+0.1y)/2-(4x-y)/10=(x-y)/5+(3x+0.5y)/30①(3x+2y-1)/8=3-(0.8x-5y)/41②①两边同时乘以60得(6x+3y)-(24x-6y)=(
解题思路:先利用完全平方公式求出x、y的值,再代入求出代数式的值。解题过程:
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-x)^29^-x*27^y=3^-2x*3^3y=3^(-2x+3y)=3^(-