x\0.8=14\21
20+0.8x=x-14 112-4x=2x(80-4x)
请问 x+(x+7)+(x+14)+(x+21)+(x+28)=75 这个方程式怎么解?
x:21=0.8:14 解比例
x-0.8x=16 x=?
2x+(14-x)=x+14
0.3:2X=1:650—X/4=0.8:1/249:(10—X)=14:21/15:1/5=1/X:1/3
(x^3)^()*x^2=x^14
x-4x=102 x-0.8x=22
x-0.8x=46
X-0.8X=2
(1)2(x+15)-21=3x-15 (2)3(x+8)=5x+8 (3)4(x+5*0.8)=7x+5*0.8 (4
x-30%x=14x+25%x=20