求未知数x. 3.2×2.5-75%x=212÷(0.5x+1)=4(x-1):37
网友回答
(1)3.2×2.5-75%x=2
8-0.75x=2
8-0.75x+0.75x=2+0.75x
8-2=2+0.75x-2
6÷0.75=0.75x÷0.75
x=8
(2)12÷(0.5x+1)=4
12÷(0.5x+1)×(0.5x+1)=4×(0.5x+1)
12÷4=4×(0.5x+1)÷4
0.5x+1-1=3-1
0.5x÷0.5=2÷0.5
x=4
(3)(x-1):37
======以下答案可供参考======
供参考答案1:
4x-24=2x+20
4x-2x=20+24
2x=44x=44÷2
x=22供参考答案2:
4x-24=2x+20
x-18x=24
x=-4/3