Question

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Answer 1

Bài 1

1) -1/4 + 3/4 : 6

= -1/4 + 1/8

= -1/8

2) (-1/6 - 5/13 + 11/12) - (8/13 - 7/6 - 1/3)

= -1/6 - 5/13 + 11/12 - 8/13 + 7/6 + 1/3

= (-1/6 + 7/6) + (-5/13 - 8/13) + (11/12 + 1/3)

= 1 - 1 + 5/4

= 5/4

3) (-2/3)² . 3/5 + √(4/25) : 9/4 - 1,75

= 4/9 . 3/5 + 2/5 . 4/9 - 7/4

= 4/9 . (3/5 + 2/5) - 7/4

= 4/9 - 7/4

= -47/36

Answer 2

Bài 2

1) -1 2/5 - x = 2/3 - 4/5

-7/5 - x = -2/15

x = -7/5 + 2/15

x = -19/15

2) [√(9/64)+ x] - 1 1/2 = -3/4

3/8 + x - 3/2 = -3/4

x = -3/4 - 3/8 + 3/2

x = 3/8

3) 2.3ˣ⁺² + 4.3ˣ⁺¹ = 10.3⁶

3ˣ⁺¹.(2.3 + 4) = 10.3⁶

3ˣ⁺¹ . 10 = 3⁶ . 10

3ˣ⁺¹ = 3⁶

x + 1 = 6

x = 6 - 1

x = 5