Найдите значения выражений: 1) 3(a-2)-b(a-2), при а=4; b= 5; 2) 2x(y-3)5(3-у), при х=1,2; b= 8; 3) За(a b)-2b(ab)+3(a+b), при а= -2; b=3; 4) x(x-2y)-(2y-x)+5(2y-x), при x=-5; y=2. помогите пж ​
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