5x(x-4)-2.5=20(x-3)
1个回答
5x(x-4)-2.5=20(x-3)
5x-20-2.5=20x-60
5x-22.5=20x-60
20x-5x=60-22.5
15x=37.5
x=37.5÷15
x=2.5
相关问题
观察下列单项式:1/2x,-2/3x^2,3/4x^3,-4/5x^4,5/6x^5,…,19/20x^19,-20/2
(3/5x-20)*4/5=2/5x
(2X2)/1X3+(4X4)/(3X5)+(6X6)/(5X7)+...+(20X20)/(19X21)==?
(4)1/6(3x-6)=2/5x-3 (5)3(x-7)+5(x-4)=15 (6)4x-3(20-x)=-4
分解因式:(1)x^2+3x-4;(2)x^2-3x-4;(3)x^2+8x-20;(4)x^2-5x-24;(5)x^
3x4+4x5+5x6+.19x20+20x21=?
6/1(3x-6)=5/2x-3 3(x-7)+5(x-4)=15 4x-3(20-x)=-4 2/y-1=2-5/y+
2(x+3)-5(1-x)=3(3-1) 4-3(2-x)=5x 4x-3(20-x)=6x-7(9-x) 4-3(2-
解方程.[4/5]x-[2/3]x=24[x/5]=20%[1/5]:0.5=3:x.
一元一次方程:15x-40=5x+10 2(-3)-4(x-3)=8 4x-3(20-x)=5x-7(20-x)