Предмет: Алгебра, автор: nikolaivan

Решите уравнения:а)8х-15,3=6х-3,3:б)18-(6х+5)-4-7=9х:в)6(х+0,5)-3=9 решите задачу:Периметр прямоугольника равен 24см.Его ширина в 3 раза меньше длины.Найдите длину и ширину прямоугольника.Задача2:В первой корзине в 2 раза меньше яблок,чем во второй.Когда из второй корзины переложили в первую 14 яблок,то в обеих корзинах яблок стало поровну.Сколько яблок было в каждой корзине первоначально?:решите уравнения |х|=49 б)6х седьмых=х-5 вторых.

Ответы

Автор ответа: coolkabanova20
0
8х-15,3=6х-3,3: Решение 8х-6х=-3,3+15,3 2х=12 х=12:2 х=6 Ответ. х=6 б)18-(6х+5)-4-7=9х: Решение 18-6х-5-4-7=9х -6х-9х=-18+5+4+7 -15х=2 х=2:(-15) х= -2/15 в)6(х+0,5)-3=9 Решение 6х+3-3=9 6х=9-3+3 Х=9:6 х=1.5 задача:Периметр прямоугольника равен 24см.Его ширина в 3 раза меньше длины.Найдите длину и ширину прямоугольника. Решение: Пусть х будет ширина, тогда длина 3х. Периметр = (х+3х) • 2, а по условию задачи 24. Составим и решим уравнение. (х+3х) • 2 = 24 2х + 6х = 24 8х=24 х=24:8 х=3, значит 3 см это широта. 2) 3х = 3•3=9 (см) длина Ответ: 3 см и 9 см.
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1. Mrs. White ... (has picked / is picking / picks / picked) a lot of apples. The apples are in the basket.
2. Look ... (in/on/at/up) the window! It ... (rains / rained / has rained /is raining) again!
3. The man ... (who's / which/whose / whom) car was stolen last night is at the police station,
4. My mother has got lovely hair, ... (doesn't she/ don't they / hasn't she/haven't they)?
5. The man told us that the next train would arrive ... (in three thirty o'clock / at three thirty / at three
thirty o'clock / in three thirty).
6. If we ... (will play / are playing/play) football on Saturday, I ...(am/ being / will be) tired on Sunday,
7. "Where ... (are you go / do you go / did you go / have you went) last weekend?" "I went to see my
relatives."
8. If you ... (aren't hurry / hurried / don't hurry / doesn't hurry), you will miss the train.
9. I have known Jack ... (since / for/in/during) five years.
10. Have you got (some/any/no) time to spare()? I'd like to ask you (some/any/no) questions.
11. "Where is John?" "He's upstairs. He ... (does / has done / is doing / did) his homework."
12. Nobody invited me to the party last month, ... (don't / didn't/ did / had) they?
13. Sarah is very tired. She ... (works / is working / has been working / worked) hard all day.
14. Sophie is very clever. She ... (speaks / is speaking / has spoken/ spoke) seven different languages.
15. The roads were very wet. It ... (rains/is raining / was raining / had been raining) all day.
16. Her car broke down yesterday while she ... (was driven/was driving/drove / drives) to work.
17. You must ... (to eat/eat / eating/eaten) lots of fresh fruits.
18. The tree ... (cut/ is cut/ was cutting / was cut) down last week.
19. ... (Did you tidy / Have you tidied / Were you tidying/Were you tidied) the room when she entered
the house?​