Maths help me－百科全書

標題:

Maths help me

發問:

y+2/5-3(y-3)/10=1/4

最佳解答:

y+2/5-3(y-3)/10=1/4 全部sol： y+2/5-3(y-3)/10=1/4 y-(3y-9)/10=1/4-2/5 10y/10-(3y-9)/10=5/20-8/20 (7y+9)/10=-3/20 7y+9=-3/20 x 10 7y+9=-3/2 7y=-3/2-9 7y=-3/2-18/2 7y=-21/2 y=-21/14 y=-3/2 簡單D： y+2/5-3(y-3)/10=1/4 10y/10-(3y-9)/10=5/20-8/20 (7y+9)/10=-3/20 7y+9=-3/2 7y=-21/2 y=-3/2 努力點讀書就可以明白當中技巧的啦~ 還有選我啊，很多人都等第一個回答然後照copy架~~

其他解答:

y+2/5-3(y-3)/10=1/4 y+2/5-(3y-9)/10=1/4 y=1/4-2/5+(3y-9)/10 y=5/20-8/20+(6y-18)/20 y=(6y-21)/20 20y=6y-21 20y-6y=6y-6y-21 14y= -21 14y/14= -21/14 y= -3/2 y= -1.5