急-]]5識做數學]],,幫幫手

1.
0.7t+2.5=17.9
0.7t=17.9-2.5
t=15.4/0.7
t=22

2.
nx(1-45%)+135=245
nx0.55=245-135
n=110/0.55
n=200

3
1.4x0.5xｗ=56x75
w=4200/0.7
w=6000

不過有兩條錯左

1.0.7t+2.5=17.9
0.7t=15.4
t=22
2.nx(1-45%)+135=245
55%n+135=245
11n/20=110
n=200
3.1.4x0.5xｗ=56x75
1.4*0.5w=4200
7w=4200
w=600

2007-05-15 17:02:16 補充：
7w=4200w=600 change it to0.7w=4200w=6000

t=22
n=200
w=6000

1. t=22
2. n=200
3. w=6000

1) 0.7t+2.5-2.5=17.9-2.5
0.7t=15.4
t=15.4*0.7
t=22
2) nx(1-45%)+135=245
nx55%+135-135=245-135
nx55%=110
n=110*55%
n=200
3) 1.4x0.5xw=56x75
1.4x0.5xw=4200
0.7xw=4200
w=4200*0.7
w=6000

0.7t+2.5=17.9
0.7t = 17.9-2.5
t= 15.4/0.7
t=22
n x (1-45%) + 135 = 245
n x 55%=110
n = 200
1.4x0.5xｗ=56x75
w = 56 x 75 / 1.4 x 0.5
w= 6000

0.7t+2.5=17.9
0.7t = 17.9-2.5
t= 15.4/0.7
t=22

n x (1-45%) + 135 = 245
n x 55%=110
n = 200

1.4x0.5xｗ=56x75
w = 56 x 75 / 1.4 x 0.5
w= 6000

0.7t+2.5=17.9
0.7t=15.4
t=22
nx(1-45%)+135=245
55%n=110
n=200
1.4x0.5xｗ=56x75
0.7w=4200
w=6000