Вычисли
N1
1) 3,4-3•t-(t-28) t=4
2) 3m(2m-5)-8m(4m-3) m=1
N2
1) x(x-y)-y(y2-x) x=4,y=2
2) 25a-4(3a-1)+7(5-2a) a=11
Упрости выражение
1) -4,3x-5,2x+8,7y
Помогите пожалуйста
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