Номер 24
1273*56=71.288
2031*61=123.891
123.891>71.288
1)(с-120) * 70 = 280 с- 120= 280 :70 с-120= 4 с= 120+4 с =124 2)x:(160:80)=105 x:2=105 x=105*2 x=210 3)x:(160:8)=0 x:20=0 x=0*20 X=0
1/3х + 1/7у - 1/7х +1/2у =
= 1/3х - 1/7х +1/7у + 1/2у =
= 7/21х - 3/21х 2/14у + 7/14 у =
= 4/21х + 9/17у
Ответ 2 я считаю - правильный.
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