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Giúp mik vs lm cả 2 bài nhé ????????
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Bài 4 :
`a, 1234 – 2 . 17 . 5 + 566`
` = 1234 + 566 – (2.5.17)`
`=1800 – 170`
`=1630`
`b, 31.54+46.31-58-42`
`= 31.54+46.31-(58+42)`
`=31.(54+46) – 100`
`=31.100 – 100`
`=3100 – 100`
`=3000`
Bài 5:
`a, 54 + x = 7.12`
`54 + x = 84`
`x=84 – 54`
`x=30`
Vậy `x=30`
`b, 387 – 128 . ( x^2 : 12 ) = 3`
`128 . ( x^2 : 12 ) = 387 – 3`
`128 . ( x^2 : 12 ) = 384`
`x ^2 : 12= 384 : 128`
`x ^2 : 12=3`
`x ^2= 3.12`
`x^2= 36`
`x^2 = 6^2`
`x= 6`
Vậy x = 6
`#Stduy well`
Bài 4:
a. 1 234 – 2 . 17 . 5 + 566
= ( 2 . 5 ) . ( 1 234 + 566 ) -17
= 10 . 1800 – 17
= 18 000 – 17
= 17 983
b. 31 . 54 + 46 . 31 – 58 – 42
= 31. ( 54 + 46 ) – 58 – 42
= 31. 100 – 58 – 42
= 31. ( 100 – 58 ) – 42
= 31. 42 – 42
= 31. 42 – 42.1
= 42. ( 31 – 1 )
= 42. 30
= 1 260
Bài 5:
a. 54 + x = 7.12
54 + x = 84
x = 84 – 54
x = 30
b. 387 – 128 . ( x^2 : 12 ) = 3
128 . ( x^2 : 12 ) = 387 – 3
128 . ( x^2 : 12 ) = 384
x ^2 : 12 = 384 : 128
x ^2 : 12 = 3
x ^2 = 3.12
x^2 = 36
x^2 = 6^2
x = 6