12/x = 400/160
12/x = 400/160 , x ≠ 0
12/x = 5/2
24 = 5x
5x = 24
x = 24/5 , x ≠ 0
x = 24/5 = 4,8
1,44/4 = x/5
0,36 = x/5
1,8 = x
x = 1,8
125/0,5 = x/1,5
250 = x/3/2
250 = 2x/3
750 = 2x
2x = 750
x = 375
19/32+27/32=46/32=1 14/32
11/18+3/5=55/90+54/90=109/90=1 19/90
5/8+13/28=35/56+26/28=61/28=2 5/28
5/8+41/56=35/56+41/56=76/56=1 20/56=1 5/14
15/46+21/23=15/46+42/46=57/46=1 11/46
7/10+5/9=63/90+50/90=113/90=1 23/90
5/9+23/90=50/90+23/90=73/90
7/12+25/48=28/48+25/48=53/48
Утверждение неверно.
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