100-50x-20x+15
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100-50x-20x+15100-50x-20x+15100-50x-20x+15100-50x-20x+15-70x-45x≤-100-15-115x≤-115x≥1115-70x≤45x110x
100-50x-20x+15
100-50x-20x+15<=45x
100-50x-20x+15
100-50x-20x+15<=45x
-70x-45x≤-100-15
-115x≤-115
x≥1
115-70x≤45x
110x≥110
x≥1
X》=1
100-50x-20x+15
30-3(3-X)=4X 3X+12*6=15X+12 4X-2(50-X)=20 12(X-13)=10(X+3) 100-X=3(20+X)
8(x+15)-20=10x 2(100-x)-15=150-x 25x-165=10(15-x) 5(x-10)=3x-6
8(x+15)-20=10x 2(100-x)-15=150-x 25x-165=10(15-x) 5(x-10)=3x-6
(X+X)+(X-X)+(X*X)+(X/X)=100
通分:x+4/x^2-8x+15,x-5/x^2+x-12,x-3/x^2-x-20
30%x=50%x-20x
x - 15%x+20%x=23.
x-2=(104-x)+2 6x-59=10x-75 (x+10)+(x-15)=280-x4(x-62)=x-38 60x-40=(60+20)*(x-5) 32x+32*0.5-25x+64x=24x+496-49x x+15=3*(109-x ) 5(3x-1.4)=2(6x-0.5) 3(x+0.9)=5(x-1.7) 13x-4(2x+5)=17(x-2)-4(2x-1) (13x+8)/3=5x-1x-60=2[(3561-x)+100]+1 (x+9)+12=2[(x-9)-1
1.直接写出x的值.1.80%x=12 2.x=50%x=30 3.x-20%x=16 4.75%x-20%x=11 5.30%x=150 6.x=15%X=467.x-70%x=9008.60%x-五分之一x=809.85%x-35%x=35这个1.或者2.不是小数哦,
3/4x-20+15/50-2x*x+7/6x+30=0
50%x+x=20 x+30%x=52
5x+15x =( + )x =20x
x-50%x=100
X+25%X+15%X=420 2X+150=20501.5X-1200=(1+20%)2X-5+X=100
15X(4X-8)-5X(2X+10)=6X(5X-20)
解方程:(1)2x-19=7x+31 (2)20-2x=x-1 (3)19-x=100-10x (4)1/3x+5=2/3x-62x-19=7x+317x-2x=-19-31这里应该是31+19吧?5x=-50x=-50÷5x=-10
.X²+13X+36 .X²+5X-20 .X²-2X-15 .8(X²+X)²-8(X²+X)+12