Question

[Thu HIền]

B1

a,\(\dfrac{7}{3}\).\(\dfrac{37}{5}\)-\(\dfrac{7}{3}\).\(\dfrac{32}{5}\)

b, 3:+\(\left(-\dfrac{3}{2}\right)^2\)+ \(\dfrac{1}{9}\).\(\sqrt{36}\)

c,\(\left(-2\right)^2\) + \(\sqrt{36}\)-\(\sqrt{9}\)+\(\sqrt{25}\)

d, \(\left(-\dfrac{2}{3}+\dfrac{3}{7}\right)\) : \(\left(-\dfrac{1}{3}+-\dfrac{4}{7}\right):\dfrac{4}{5}\)

B2

a, \(\dfrac{3}{4}\)+\(\dfrac{1}{4}\):x = \(\dfrac{1}{2}\)

b, -8 + 2 . |2x-3| =4

c, |x - \(\dfrac{1}{3}\)|- \(\sqrt{\dfrac{1}{6}}\)=\(\sqrt{\dfrac{1}{9}}\)

Answer 1

[phạm khánh linh]

B1

a. = 7/3. ( 37/5 - 32/5)

= 7/3 . 1

= 7/3

Phần b có gì đó sai sao lại có 3:+

c. = 4 + 6 - 3 + 5

= 12

d. = -5/21 : -19/21 : 4/5

= 25/76

B2

a. 1/4 : x =1/2 - 3/4

x = -1/4

x = 1/4 : -1/4

x = -1

b. 2 . | 2x - 3 | = 4 - (-8)

2 . | 2x - 3| = 12

| 2x - 3 | = 12:2

| 2x - 3 | = 6

| x - 3 | = 6:2

| x - 3 | = 3

=> x - 3 = +- 3

* x - 3 = 3

x = 6

* x - 3 = -3

x = 0

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Answer 2

[phạm khánh linh]

b. = 3 : 9/4 + 1/9 .6

= 4/3 + 2/3

= 2