y=1/2＜x∧4－6x∧2＋8x+7＞ 描绘函数图形 需要表格那种,

把(x+y),(x-y)个作为一个整体合并同类项1,7(x+y)-2(x+y)-4(x+y)+2(x+y)2,(x-y)²＋2(x-y)－(x-y)－2(x-y)² *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 y=1/2＜x∧4－6x∧2＋8x+7＞ 描绘函数图形 需要表格那种, 解下列方程组或不等式组...一{ x(x-5)+y(y+6)=x平方+y平方-39 二 { x(x+7)-y(y-8）=x平方-y平方-11一{x（2x-5）大于2x平方-3x-4二{（x+1）（x-3）+8x大于（x+5）（x-5）-2 几道分式求值 速度 马上就要1. 1/x-y + 1/x+y + 2x/x^2+y^2 + 4x^3/x^4+y^4 + 8x^7/y^8-x^82. x-8/x-9 - x-7/x-8 - x-5/x-6 + x-4/x-53. 1/x^2+3x+2 + 1/x^2+5x+6 + 1/ x^2+4x+34. 1/x^2+2x-1 - 2/x^2+2x+1 + 1/ {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 求值域 1,y=(x+2)/(x*x+3x+6) 2,y=3x/(x*x+4) 初二计算 解方程 不等式组(1)4(y-z）^2-(2y+z)(-z+2y) (2)(x(x^2y^2-xy)-y(x^2+x^3y)/4x^2y (1)(x+7)(x+5)-(x-1)(x+5)=42 (2)x(2x-5)＞(x-1)(2x-1）-7 (x+1)(x+3)+8x＞(x+5)(x-5)-2 x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=? 例X=1 y=21.X+Y=5 X-Y=15 2.2X+3Y=4 5X+6Y=7 3.X+3Y=5 3X+Y=-1 4.2X+Y=3 3X+5Y=11 5.4X+3Y=6 2X+Y=4 6.X+Y=180 X=3Y-10 7.3X-2Y=3 2X-Y=7 8.5X+3Y=7Y X+Y=45 9.3X+4Y=126X+8Y=24 X:6Y=1:4 10.X+Y=138 X-45=Y+53 11.X+Y=60 14Y=20X 12.2X+3Y=15.5 5X+6Y=35 13.X+Y=170 3 y=(x∧2－2x＋2)/x x∈(0,1/4】的取值范围 7X-7=4X-14X-3+3X=6X-26*(2X-7)=5*(X+8)+20.2*(5X-1)+5*(X-1)=0.82*(3y-4)+7*(4-y)=4y 函数的值域(1)y=3x (2)y=8/x (3)y=-4x+5 (4)y=x^2-6x+7 同志们 ... 先化简再求值：-3（2x-y）-｛7-〔6x+2y-(10x-8y)〕+x-2(3x-4y)｝已知x=－1/5,y=－5 1.(x^3-x^2-4x+1)/(x^2-3x+2)-(x^3-2x^2-9x+21)/（x^2-5x+6）+（x^2-3x+8）/（x^2-4x+3）2.{(x^2)/（x-y)}*{y/(x+y)}-{(x^4y)/(x^4-y^4)}÷{（x^2/x^2+y^2）^2}