Laura ___ her exam because she had studied very hard. 1 didn't pass
2 was passing
3 passed
4 did pass​

3.passed

Пошаговое объяснение:

сорри если не правильно

1.y=3+(x^3)/3-x^3

y"(x)=3(x^2)/3-3(x^2)=x^2-3x^2=-2x^2

2.y=ln(2x^6-5x^2)

y"(x)=1/(x^2(2x^4-5))*(2x^6-5x^2)"=1/(x^2(2x^4-5))*(12x^5-10x)=(12x^5-10)/(2x^5-5x)

12+5 =17 ( шт) на столько больше

стало чайников