Предмет: Математика, автор: anardekovaauana

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Автор ответа: alexeikiryutin
1

Ответ:

x=1

Пошаговое объяснение:

\frac{x-4}{12} -\frac{2x+5}{3} +\frac{x}{4} =1\\\frac{x-4}{12}-\frac{8x+20}{12}+\frac{3x}{12} =1\\x-4-8x+20+3x=12\\x+3x-8x=12-20+4 \\-4x=-4\\x=1

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PRESENT SIMPLE TEST

1 I ___ watch TV very often.
a) doesn't b) don't c) aren't
2 How often ... you go shopping?
a) are b) do c)does
3 She always ______ lunch at school.
a) takes b) have c) has
4 ____ you _____ swimming?
a) Do you like b) Does you like c) Are you like
5 My red pen ___ on the floor.
a) am b) is c) are
6 She ______ her job. She ______ to be a singer.
a) isn’t liked ... wants b) doesn’t like ... wants c) don’t like ... want
7 _____ you know that girl?
a) Do b) Does c) Are
8 He ______ in a hurry.
a) is b) be c) doesn’t be
9 Dad often _____ Mummy about the house.
a) help b) helps c) help
10 ___ you play piano? No, I ____.
a) Do ... doesn't b) Do ... don't c) Are ... not
11 I ___ a football fan.
a) am b) is c) are
12 ______ you ______ where your uncle ______ ?
a) Do ... know ... is b) Do ... know ... was c) Are ... know ... is
13 The weather is usually good here. It _____ snow very often.
a) not b) doesn’t c) don’t
14 ____ Kate Jones ____ German?
a) Is ... speak b) Does ... speak c) Do ... speak
15 Polly and Jessica ___ from Los Angeles.
a) am b) is c) are
16 Helen ______ a lot of vegetables. She _____ carrots.
a) doesn’t eat ... likes b) eats ... likes c) ate ... like
17 Jane lives not far from us, but we ____ her often.
a) not see b) doesn’t see c) don’t see
18 I ___ happy.
a) am b) is c) are
19 The Pitts ____ a nice farm in the country.
a) has got b) have got c) got
20 They ___ English.
a) am b) is c) are