Question

bài1:a)37.75-75.7+75.70;b)25.(32+47)-32.(25+4⁷);c)(-16).125.[(-3).2²].5³-2.10⁶d)(134-34).(-28)+72[(55-45];e)(-3)²+3³-(-3)⁶;f)4524-(864-999)-(36+3999);g)(-3752)-(29-36.32).51;k)1000-(137+572)+(263-291);i)(-329)+(15-101)-(25-440)

bài2:a)x-15=(-11)-(-16);b)7-2x=(-37)-(-26);c)(-300):20+5.(3x-1)=25 

Answer 1

a) 37 . 75 - 75 . 7 + + 75 . 70

= 75 . (37 - 7 + 70)

= 75 . 100

= 7500

b) Sửa đề:

25 . (32 + 47) - 32 . (25 + 47) 

= 25 . 32 + 25 . 47 - 32 . 25 - 32 . 47

= 47 . (25 - 32)

= 47 . (-7)

= -329

Answer 2

c) (-16) . 125 . [(-3).2²] . 5³ - 2 . 10⁶

= (-200) . (-12) . 8 - 2 . 1000000

= 19200 - 2000000

= -1980800

d) (134 - 34) . (-28) + 72 . (55 - 45)

= 100 . (-28) + 72 . 10

= -2800 + 720

= -2080

Answer 3

a)x-15=(-11)-(-16)

x - 15 = 5

x = 5 + 15 

x = 20

vậy x = 20

b)7-2x=(-37)-(-26)

7 - 2x = -11

2x = 7 - (-11)

2x = 18

x = 18 : 2

x = 9

vậy x = 9