Question

Выражения 1) (7m2+4n3)2 2) (0,2a2-0,1b3)2 3) (-4x3+5y4)2 4) (-10k-5d)2 выражения 1) 2(5a+3b)2-(5a-3b)2 2) 3(2a2-3b2)2-4(3a2+2b2)2

Answer 1

1) (7m²+4n³)²=49m^4+56m²n³+16n^6
2) (0,2a²-0,1b³)²=0,04a^4-0,04a²b³+0,01b^6
3) (-4x³+5y^4)²=16x^6-40x³y^4+25y^8
4) (-10k-5d)²=10k²+100kd+25d²

1) 2(5a+3b)²-(5a-3b)²=(5a+3b-5a+3b)(5a+3b+5a-3b)=6b*10a=60ab
2) 3(2a²-3b²)²-4(3a²+2b²)²=12a^4-24a²b²+27b^4-36a^4-48a²b²-16b^4=
=-24a^4-72a²b²+11b^4