Question

упростить выражение
3x(5+x)^2-x(3x-6)^2
0.6(ab-1)^2+1.4(ab+2)^2

Answer 1

3x(5+x)²-x(3x-6)²=3x³+30x²+75x-9x³+36x²-36x=-6x³+66x²+39x
0.6(ab-1)²+1.4(ab+2)²=0.6a²b²-1.2ab+0.6+1.4a²b²+5.6ab+5.6=2a²b²+4.4ab+6.2