作业帮22.5-0.4X
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/04 23:18:49
x=0.05/（0.4-0.1x)0.4x-0.1x²=0.05x²-4x+4=4.5(x-2)²=4.5x1=2+3√0.5,x2=2-3√0.5
(0.4x-1)/0.5-(5-x)/2
(0.6x+360):x=3:40.2x+120=1/4x0.8x+480=xx=2400再答：x:60%x+360=4:31/4x=20%x+120x=0.8x+480x=2400再答：小意思再问：
4x-0.4=5x-（-24.6）移项得到5x-4x=-（-24.6）-0.4得到x=25
22.5-0.4x=12.522.5-12.5=0.4x10=0.4xx=25
X-0.4X=360.6X=36X=60
0.2x+0.4x=120.6x=12x=12÷0.6x=2020x+x=42021x=420x=420÷21x=20
0.6x
22.5-0.4x=1250.4x=22.5-1250.4x=-102.5x=-256.25如果不懂,祝学习愉快!再问：修一条水渠，甲队单独修要18天，乙队单独修要12天，甲队先修3天，剩下的两队合修
答案0.6x
3.2x=170%x+22.53.2x=1.7x+22.53.2x-1.7x=22.51.5x=22.5∴x=15
x=100
0.6×=0.54×=0.54÷0.6×=0.9
0.5x+0.2=x-1.50.5x=1.7x=3.4
0.4x-2.5x=0.05-3.22.1x=3.15x=1.5
X—0.4X=16.20.6X=16.2X=27
5-2分之7X=2分之33.5x=3.5x=17+0.4X=1010.4x=94x=2356分之5x-1=12分之135/6x=25/12x=2.59X+X=25.610x=25.6x=2.5622.
0.4x+0.3x=18.9==》0.7x=18.9==》x=18.9/0.7=27
原方程化为0.4x+13.6x-0.8x²=10那么-0.8x²+14x-10=0故2x²-35x+25=0即求得x=5(7±√41)/4
（1）22.5-0.4x=12.5， 22.5-0.4x+0.4x=12.5+0.4x， &nb