Предмет: Математика, автор: marinabituckaa450

Номер 11а
Упрости выражения
15а*4
3b*12
17a*5
11a*7
21d-18d+3
14a+a+9+4

Ответы

Автор ответа: masharipovqudratillo
1
Решение:
Чтобы упростить первые 4 выражения, нужно умножить между собой числа, а переменные оставить без изменений.
15а · 4 = (15·4)а = 60а.
3b · 12 = (3·12)b = 36b.
17a · 5 = (17·5)a = 85a.
11a · 7 = (11·7)a = 77a.
Чтобы упростить 2 последних выражения, нужно сгруппировать и привести подобные члены.
21d - 18d + 3 = (21-18)d + 3 = 3d + 3.
14a + a + 9 + 4 = (14+1)a + 13 = 15a + 13.
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Три задания за которые даю много баллов! Принимаются только верные ответы

Задание 1.

Заполните пропуски подходящими словами.

Harvested, twigs, bud, bat, bee, thorns, snail

A flower that is just about to open is called a ____________________.
Take care not to prick yourself. That plant has sharp __________________.
If we pick up those __________________, we can use them to start the fire.
Jim’s as blind as a ________________________.
Ann’s as busy as a _____________ while Jo works at a ____________’s pace.
Most crops in the UK are __________________ in the autumn.



Задание 2.

Выберите правильный вариант.

Fortunately there was no damage/damation done.
The level of pollute/pollution in the air is rising.
He has a large collect/collection of stamps.
The place will be filled by open competition/competetion.
It’s the company's annual award/awardtion for high-quality service.
Television is an effective means of communicatetion/communication.
This is a fine book; a worthy addition/add to the Cambridge Encyclopedia series.
She has the qualifitions/qualifications for the job.
What can you say about the increasing globalizetion/globalization of the world economy?
His education/educatetion is encyclopedic and eclectic.



Задание 3.

Образуйте прилагательные из слов в скобках.

It was ___ (sense) of her to postpone the trip.
London is still the ___ (culture) capital of the country.
The Smiths are industrious and ___ (peace) people.
This policy may have been in the ___ (nation) interest.
The company received a ___ (posit) response from investors.
The ___ (talk) driver hadn't stopped chatting.
I don’t understand what ‘the ___ (chemistry) composition of the atmosphere’ means.
She didn’t know her ___ (biology) mother.
They lived in a small ___ (industry) town.
Pollution is posing a serious threat to the ___ (ecology) balance of the oceans.