初一数学解方程:(0.4y+0.9/0.5)-(y-5/2)=0.3+0.2y/0.3初一数学解方程:(0.4y+0.9/0.5)-(y-5/2)=0.3+0.2y/0.3
问题描述:
初一数学解方程:(0.4y+0.9/0.5)-(y-5/2)=0.3+0.2y/0.3
初一数学解方程:
(0.4y+0.9/0.5)-(y-5/2)=0.3+0.2y/0.3
答
(4y+1.8)-10y+25=3+2y/3
12y+6.4-30y+75=9+2y(各项同时乘以3)
20y=72.4
y=36.2
答
0.4y+1.8-y+2.5=0.3+2/3y
解 -0.6y+4.3=0.3+2/3y
-(19/15)y=-4
y=19/60