Bài 1:
a) 3 . 5² + 15 . 2² - 26 : 2
= 75 + 60 : 13
= 122
b) 84 : 4 + 3^9 : 3^7 + 5^0
= 21 + 39-7 + 0
= 21 + 3² + 0
= 30
c) 29 - [16 + 3.(51 - 49)]
= 29 - (16 + 3 . 2)
= 29 - (16 + 6)
= 29 - 22
= 7
d) 1 - [30 - (5 - 1)²]
= 1 - (30 - 16)
= 1 - 14
= -13
e) (-297) + 630 + 297 + (-330)
= 630 - 330
= 300
Bài 2:
a) 58 . 75 + 58 . 50 - 58 . 25
= 58 . (75 + 50 - 25)
= 58 . 100
= 5800
d) 143 . 64 - 64 . 43
= 64 . (143 - 43)
= 64 . 100
= 6400
Bài 3:
d) 9x-1 = 9
x - 1 = 9 : 9
x - 1 = 1
x = 1 + 1
x = 2
g) 17 - |x - 1| = 7
|x - 1| = 17 - 7
|x - 1| = 10
|x| = 10 + 1
x = 11
