## Cảm hơn Thack you vinamiu

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Cảm hơn
Thack you vinamiu

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4 years 2020-10-24T06:48:19+00:00 2 Answers 94 views 0

1. Bài 74:

a) 541+(218-x)=735

⇒ 541+218-x=735

⇒ 759-x=735

⇒ x=759-735=24

b) 5(x+35)=515

⇒ 5x+175=515

⇒ 5x=515-175=340

⇒ x=340/5=68

c) 96-3(x+1)=42

⇒ 3(x+1)=96-42=54

⇒ x+1=54÷3

⇒ x+1=18

⇒ x=18-1=17

d) 12x-33=3².3³

⇒ 12x-33=3^5

⇒ 12x-33=243

⇒ 12x=243+33=276

⇒ x=276/12=23

2. $\text{Chào bạn. Bạn tham khảo nhé !}$
$\text{Bài làm :}$ $\text{Bài 74 : Tìm x ∈ N, biết :}$
$\text{a, 541 + ( 218 – x ) = 735}$
$\text{ 218 – x = 735 – 541}$
$\text{ 218 – x = 194}$
$\text{ x = 218 – 194}$
$\text{ x = 24}$
$\text{b, 5( x + 35 ) = 515}$
$\text{ x + 35 = 515 ÷ 5}$
$\text{ x + 35 = 103}$
$\text{ x = 103 – 35}$
$\text{ x = 68}$
$\text{c, 96 – 3( x + 1 ) = 42}$
$\text{ 3( x + 1 ) = 96 – 42}$
$\text{ 3( x + 1 ) = 54}$
$\text{ x + 1 = 54 ÷ 3}$
$\text{ x + 1 = 18}$
$\text{ x = 18 – 1}$
$\text{ x = 17}$
$\text{d, 12x – 33 = 3^2 . 3^3}$
$\text{ 12x – 33 = 9 . 27}$
$\text{ 12x – 33 = 243}$
$\text{ 12x = 243 + 33}$
$\text{ 12x = 276}$
$\text{ x = 276 ÷ 12}$
$\text{ x = 23}$

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