ndusha

Verified answer

x:12=17
х=17*12
х=204

561:x=11
х=561:11
х= 51

17x-9x=672
8х=672
х=672:8
х=84

supervlad168

Verified answer

1) x:12=17 
x/12=17
x=204
2) 561:x=11
561/x=11
561/x=11, x - не равно 0
561=11x
11x=561
x=51, x - не равно 0
x=51
3)17x-9x=672
8x=672
x=84