Question

Упростите выражение:
-5xy^2 y^2*(-0,4x^2 y^2)
3x(2y+3x)-(y+3x)^2​

Answer 1

$- 5xy {}^{2} y {}^{2} \times ( - 0.4x {}^{2} y {}^{2} ) = - 5 \times ( - 0.4)x {}^{1 + 2} y {}^{2 + 2 + 2} = 2x {}^{3} y {}^{6 } \\ \\ 3x(2y + 3x) - (y + 3x) {}^{2} = 6xy + 9x {}^{2} - (y {}^{2} + 2y \times 3x + (3x) {}^{2} ) = 6xy + 9x {}^{2} - (y {}^{2} + 6xy + 9x {}^{2} ) = 6xy + 9x {}^{2} - y {}^{2} - 6xy - 9x {}^{2} = - y {}^{2}$