數學1 . 30%x+200x=3+50%x 2.200+200%x=500%+3

(1) 30%x + 200x = 3 + 50%x
0.3x + 200x = 3 + 0.5x
0.3x + 200x - 0.5x = 3
199.8x = 3
x = 66.6

(2) 200 + 200%x = 500% + 3
200 + 2x = 5 + 3
2x = 5 + 3 - 200
2x = -192
x = -96

1)
0.3x + 200x = 3 + 0.5x
199.8x = 3
x = 3/199.8 = 0.015

2)
200 + 2x = 5 + 3
2x = -192
x = -96

2007-01-15 10:24:47 補充：
I think answer (1) is wrong...
3/199.8 = 66.6???? impossible!!

是解x嗎？我能幫你！

1. 30%x+200x=3+50%x
200x=3+50%x-30%x
200x=3+20%x
(200-0.2)x=3
199.8x=3
x=5/333

2. 200+200%x=500%+3
200+2x=5+3
2x=8-200
2x=-192
x=-96

Thew answer is 5