幾條maths題

1. 3r/5-1/2-2=6
3r/5-1/2=6+2
3r/5=8+1/2
3r=5(8 1/2)
r=42 1/2/3
r=14 1/6

2. 4-t=4t-6
4+6=4t+t
10=5t
10/5=t
t=2

3. 2w-w/4=42
2w-w/4 (4)=42*4
8w-w=168
7w=168
w=168/7
w=24

4. 4-x/2 + x-1/5-2=0
-x/2+x-1/5 =0+2-4
-5x/10+2x-2/10= -2
(-3x-2)/10=-2
(-3x-2)/10*10=-2*10
-3x-2=-20
-3x=-20+2
-x=-18/3
x=6

1. 3r/5-1/2-2=6
3r/5-1/2-2 2=6 2
3r/5-1/2 1/2=8 1/2
3r/5*5=17/2*5
3r=85/2
3r/3=85/2*1/3
r=85/6

2. 4-t=4t-6
4-t 6=4t-6 6
10-t t=4t t
10=5t
t=2

3. 2w-w/4=42
w/4=42
w/4*4=42*4
w=168

4. 4-x/2 x-1/5-2=0
4-x/2 x-1/5-2 2=0 2
4-x/2 2x/2-1/5=2
4 x/2-1/5=2
20 5x/10-2/10=2
18 5x/10=2
18 5x/10*10=2*10
18 5x-18=20-18
5x=2
x=2/5

希望幫到你!

1. 3r/5-1/2-2=6
3r/5 = 17/2
3r=85/2
r=85/6

2. 4-t=4t-6
5t = 10
t = 2

3. 2w-w/4=42
7w/4=42
w=24

4. 4-x/2 + x-1/5-2=0
x/2 = -9/5
x = -18/5