выполните умножение m(n+k);- s(d-r);3x2(x-3);-5x4(2x-x3);2a(2a2-8ab+b2);3y(5-y)-2y(y+6)
2//решите урав
15х-1=3(7х-1)-2
2х+1  + 3х+1=2;  х- 10х+1=4х+1;   х-2+2х-5+4х-1=4-х
5            7                6          6         5      4      20
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