Question

СРОЧНОООО ПОМОГИТЕ ДАМ 50 БАЛОВ


1) 7x(x-4)-x(6-x)

2) 5ab(4a+3b)-10a²(2b-4)

3) xy(2x-11y)-x(xy-14y²)

4) 5c³(4c-3)-2c(8c²-12)

Answer 1

Ответ:

1) 7x(x-4)-x(6-x) = 7x²-28x-6x+x² = 8x²-34x

2) 5ab(4a+3b)-10a²(2b-4) = 20a²b+15ab²-20a²b+40a² = 15ab²+40a²

3) xy(2x-11y)-x(xy-14y²) = 2x²y-11xy²-x²y+14xy² = x²y+3xy²

4) 5c³(4c-3)-2c(8c²-12) = 20c⁴-15c³-16c³+24c = 20c⁴-31c³+24c