Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Mk lm tắt bn cố hiểu nhé
72 : { 16 - [ 47 + ( x - 2 ) ] } = 9
➡️72 : { 16 - 45 - x } = 9
➡️72 : ( - 29 - x ) = 9
➡️- 29 - x = 8
➡️- x = 37
Vậy x = - 37
Hok tốt nhé !
a) x = 1 4 + 4 7 ⇔ x = 1.7 + 4.4 28 = 23 28 ⇔ x = − 23 28 x = 23 28
b) x − 1 = 7 2 + − 4 − 3 ⇔ x − 1 = 29 6 ⇔ x − 1 = 29 6 x − 1 = − 29 6 ⇔ x = 35 6 x = − 23 6
Ta có :
\(\frac{x-2}{12}+\frac{x-2}{20}+\frac{x-2}{30}+\frac{x-2}{42}+\frac{x-2}{56}+\frac{x-2}{72}=\frac{16}{9}\)
\(\Leftrightarrow\)\(\left(x-2\right)\left(\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}\right)=\frac{16}{9}\)
\(\Leftrightarrow\)\(\left(x-2\right)\left(\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}\right)=\frac{16}{9}\)
\(\Leftrightarrow\)\(\left(x-2\right)\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}\right)=\frac{16}{9}\)
\(\Leftrightarrow\)\(\left(x-2\right)\left(\frac{1}{3}-\frac{1}{9}\right)=\frac{16}{9}\)
\(\Leftrightarrow\)\(\left(x-2\right).\frac{2}{9}=\frac{16}{9}\)
\(\Leftrightarrow\)\(x-2=\frac{16}{9}:\frac{2}{9}\)
\(\Leftrightarrow\)\(x-2=\frac{16}{9}.\frac{9}{2}\)
\(\Leftrightarrow\)\(x-2=\frac{8}{1}.\frac{1}{1}\)
\(\Leftrightarrow\)\(x-2=8\)
\(\Leftrightarrow\)\(x=8+2\)
\(\Leftrightarrow\)\(x=10\)
Vậy \(x=10\)
Chúc bạn học tốt ~
2.
a, x-13=-46
=>x=(-46)+13
=>x=33
b, 4x-6=22
=>4x=22+6
=>4x=28
=>x=28:4
=>x=7
3.
a, 32=25
48=24.3
=>ƯCLN(32,48)=24=16
16=24
72=23.32
=>ƯCLN(16,72)=23=8
b,
24=23.3
60=22.3.5
=>BCNN(24,60)=23.3.5=120
72=23.32
180=22.32.5
=>BCNN(72,180)=23.32.5=360
72 ÷ { 16 - [ 47 + ( x - 2 ) ] } = 9
16 - [ 47 + ( x - 2 ) ] = 72 ÷ 9
16 - [ 47 + ( x - 2 ) ] = 8
47 + ( x - 2 ) = 16 - 8
47 + ( x - 2 ) = 8
x - 2 = 8 - 47
x - 2 = -39
x = -39 + 2
x = -37
Vậy x = -37
Tìm x :
a) 72: { 16 - [ 47 +( x - 2 ) ] } =9
{ 16 - [ 47 +( x - 2 ) ] }=72:9
[ 47 +( x - 2 ) ]=16-8
x - 2 =8-47
x=-39+2
x=-37