tìm x 100 – 7 . x – 5 = 58 12 . x – 1 ÷ 3 =4 mũ 2 + 3 mũ 2 24 06/07/2021 Bởi Arianna 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
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 Bình luận
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 $x = \dfrac{319}{5}$ Bình luận
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
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 $x = \dfrac{319}{5}$