CMĐT:
-(-a+b+c)+(b+c-1)=(b-c+6)-(7-a+b)+c
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1. A. heat B. scream C. meat D. dead
2. A. breakfast B. teacher C. east D. please
3. A. thrilling B. other C. through D. something
4. A. idea B. going C. will D. trip
5. A. face B. place C. prepared D. days
6. A. Germany B. garden C. gate D. gas
7. A. scholarship B. Christ C. school D. chicken
8. A. house B. harm C. hour D. husband
9. A. hundred B. exhausted C. however D. heat
10. A. head B. ready C. mean D. weather
a) Số phần tử:
\(\left(9-2\right):1+1=8\) (phần tử)
b) Số phần tử:
\(\left(20-2\right):2+1=10\) (phẩn tử)
c) Số phần tử:
\(\left(25-1\right):3+1=9\) (phần tử)
d) Số phần tử:
\(\left(104-2\right):2+1=52\) (phần tử)
e) Số phần tử:
\(\left(470-5\right):5+1=94\) (phần tử)
f) Số phần tử:
\(\left(500-10\right):10+1=50\) (phần tử)
a) Với b = 6; c = -1, ta có:
3a - 6 - 2.(-1) = 2
=> 3a - 8 = 2
=> 3a = 2 - 8
=> 3a = -6
=> a = -6 : 3
=> a = -2
b) Với b = -7; x = 5, ta có:
12 - a + (-7) + 5.5 = -1
=> a - 7 + 25 = 12 + 1
=> a + 18 = 13
=> a = 13 - 18
=> a = -5
c) tương tự
a/ Thay b = 6 và c = -1 vào 3a - b - 2c = 2, ta có:
3a - 6 - 2.(-1) = 2
=> 3a - 6 + 2 = 2
=> 3a - 4 = 2
=> 3a = 6
=> a = 2
Vậy a = 2
b/ Thay b = -7 và c = 5 vào 12 - a + b + 5c = -1, ta có:
12 - a + (-7) + 5.5 = -1
=> 12 -a - 7 + 25 = -1
=> -a = -1 - 25 - 12 + 7
=> -a = -31
=> a = 31
Vậy a = 31
c/ Thay b = -3 và c = -7 vào 1 - 2b + c - 3a = -9, ta có:
1 - 2.(-3) + (-7) - 3a = -9
=> 1 + 6 - 7 - 3a = -9
=> -3a = -9 - 1 - 6 + 7
=> -3a = -9
=> a = 3
Vậy a = 3
I. Find a mistake in each sentences and correct
1.You should going->go (A) out more (B) to relax (C) after studying
2.If you think (A) it is going (B) to be easy, you had(C) better thinking->think (D) again.
3.Visitors can (A) get a bit confusing (B) beacause (C) there are many too customs-> too many customs (D) in the country
4.In this (A) city, we have (B) the tradition to->of (C) worshinpping our ancestors. (D)
5.You mustun't (A) to tell->tell (B) anyone what (C) I just told you. It's a secret (D)
7.We (A) have a lot (B) of work tomorrow (C). You must ->mustn't (D) be late
I. Find a mistake in each sentences and correct
1.You should going=> GO (A) out more (B) to relax (C) after studying
2.If you think (A) it is going (B) to be easy, you had(C) better thinking => THINK(D) again.
3.Visitors can (A) get a bit confusing=> CONFUSED (B) beacause (C) there are many too=> TOO MANY customs (D) in the country
4.In this (A) city, we have (B) the tradition to (C) worshinpping=>WORSHIP our ancestors. (D)
5.You mustun't (A) to=>0 tell (B) anyone what (C) I just told you. It's a secret (D)
6. My family has (A) followed this tradition (B) for many generation=>GENERATIONS (C). It's good (D)
7.We (A) have a lot (B) of work tomorrow (C). You must NOT(D) be late
mk đây
kb vs mk đi
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