# tìm x 100 – 7 . x – 5 = 58 12 . x – 1 ÷ 3 =4 mũ 2 + 3 mũ 2 24

tìm x
100 – 7 . x – 5 = 58 12 . x – 1 ÷ 3 =4 mũ 2
+ 3 mũ 2
24 + 5 x = 7 mũ 5 ÷ 7 mũ 2

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1. Đáp án+giải thích các bước giải:

a)

\$100 – 7 .x – 5 = 58\$

\$100 – 7.x = 58 + 5 = 63\$

\$7.x = 100 -63\$

\$7.x = 37\$

\$x = 37 : 7\$

\$x = \dfrac{37}{7}\$

Vậy \$x = \dfrac{37}{7}\$

b)

\$12x – \dfrac{1}{3} = 4² + 3²\$

\$12x – \dfrac{1}{3} = 25\$

\$12x = 25 + \dfrac{1}{3}\$

\$12x = \dfrac{76}{3}\$

\$x = \dfrac{76}{3} : 12\$

\$x = \dfrac{19}{9}\$

Vậy \$x = \dfrac{19}{9}\$

c)

\$24 + 5x = 7^{5} : 7²\$

\$24 + 5x = 7³\$

\$24 + 5x = 343\$

\$5x = 343 -24\$

\$5x = 319\$

\$x = \dfrac{319}{5}\$

Vậy \$x = \dfrac{319}{5}\$

2. Đáp án:

100 – 7 . x – 5 = 58

100-7.x=58 + 5

100-7.x=63

7.x=100-63

7.x=37

x=37:7

x= 37/7

12 . x – 1 ÷ 3 =4 mũ 2 + 3 mũ 2

12 . x – 1 ÷ 3 =16 + 9

12 . x – 1 ÷ 3 =25

12 . x – 1=25:3

12.x-1=25/3

12.x=25/3+1

12.x=50/28

x=50/28:12

x=19/9

24 + 5 x = 7 mũ 5 ÷ 7 mũ 2

24 + 5 x =7 mũ 3

24 + 5 x =343

5x=343-24

5x=319

x=319:5

x=319/5