11.12. Найдите значение выражения: 1) 0,7ab - 49 +а - 1,2ab+ 47 при а=2/3; b=9/16
2) 53 - 5,8xy-y+ 4,8xy - 6у при х=4/13; y=13/7;
3) mn + 8m + 9mn - 10n при m=3/4; n=5/8;
4) 13,2c + d - cd - 10d - 8cd
при с=5/3; d =14/3

Пжжж помогите​
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