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Потому что в показателе был -х. Если первообразная функции f(x) равна F(x), то первообразной от функции f(cx), где с - константа, будет 1/c*F(cx). У вас с=-1.
Например, первообразная функции
будет тоже
.
Первообразная функции
будет уже
Первообразная функции
будет
В вашем примере было
По вышеукзаанному правилу первообразная от этой функции равна
.
Ну и это выражение вычиталось, т.е. минус на минус дал плюс.
Очень. легко. если нужно решить скачай photomath
(1/5)^(-1) + (1/6)^(-1) = 5 + 6 = 11
(1/4)^(-1) +(1/6)^(-1) + (1/3)^(-1) = 4 + 6 +3 =13
(1/4)^(-1) +(1/6)^(-1) + (1/5)^(-1)+ (1/2)^(-1) = 4 + 6 + 5 + 2 = 17
(1/5 * 1/3 + 1/4)^(-1)=5*3+4 = 19