Абрикос в 4 раза, а персик в 2 раза легче яблока, Масса яблока на 50 гр больше, чем масса абрикоса и персика ,Решение, какова масса яблока, персика, абрикоса? 

1)I2х-4I=10х-5 2) I-4-хI=3х/2+1

We ___ this film before. I can't remember when.

a. saw b. have seen

I think they ___ . There's a car outside. a. have arrived b. arrived

I ___ him at a conference last year. a. have seen b. saw

Mary usually phones me on Fridays, but she ___ last Friday. a. didn't phone b. hasn't phoned

I ___ four cups of coffee today. a. drank b. have drunk

I was very tired, so I ___ to bed early. a. have gone b. went

помогите срочно!!!!

найти значение производной функции у = (2х - 3) • ln(2х - 3) в точке х0 = 2.

напиши текст-розповыдь на тему "перед грозою" (5-7 речень)