Tìm x biết: x:19832-7=4:2
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x:19832+7=4:2
x:19832+7=2
x:19832=2-7
x:19832=-5
x=(-5)x19832
x=-99160
tick cho mk nha bạn
a ) 3885 / ( x * 21 ) = 37
x * 21 = 3885 : 37
x * 21 = 105
x = 105 : 21
x = 5
b ) 50343 : x = 405 ( dư 123 )
x = ( 50343 - 123 ) : 405
x = 50220 : 405
x = 124
c ) 3257 + 25286 : x = 3304
25286 : x = 3304 - 3257
25286 : x = 47
x = 25286 : 47
x = 538
a ) 3885 / ( x * 21 ) = 37
x * 21 = 3885 : 37
x * 21 = 105
x = 105 : 21
x = 5
b ) 50343 : x = 405 ( dư 123 )
x = ( 50343 - 123 ) : 405
x = 50220 : 405
x = 124
c ) 3257 + 25286 : x = 3304
25286 : x = 3304 - 3257
25286 : x = 47
x = 25286 : 47
x = 538
@_@ k mình nha
3)Chiều rộng là: 1839-283=1556 m
Chu vi là: (1839 + 1556)x2=6790
đ/s:6790 m
4057+(X:38) = 20395
X:38 = 20395-4057
X:38= 16338
X=16338 x 38
X= 620844
( 3x - 24 ) . 73 = 2 . 74
3x - 16 = 2 . 74 : 73 = 14
3x = 14 + 16 = 30
x = 10
\(\left(3\times x-2^4\right)\times7^3=2\times7^4\)
\(\left(3\times x-2^4\right)\div2=7^4\div7^3\)
\(\left(3\times x-16\right)\div2=7\)
\(3\times x-16=7\times2\)
\(3\times x-16=14\)
\(3\times x=14+16\)
\(3\times x=30\)
\(x=30\div3\)
\(x=10\)
a) Ta có:
1; 4; 7;...; 100 có (100 - 1) : 3 + 1 = 34 (số)
1 + 4 + 7+ ... + 100 = (100 + 1) × 34 : 2
= 101 × 17
(1 + 4 + 7 + ... + 100) : a = 17
101 × 17 : a = 17
a = 101 × 17 : 17
a = 100
b) (X - 1/2) × 5/3 = 7/4 - 1/2
(X - 1/2) × 5/3 = 5/4
X - 1/2 = 5/4 : 5/3
X - 1/2 = 3/4
X = 3/4 + 1/2
X = 5/4
a) (1 + 4 + 7 +...+ 100) : a = 17
1717 : a = 17
a = 101
b) \(\left(x-\dfrac{1}{2}\right)\times\dfrac{5}{3}=\dfrac{7}{4}-\dfrac{1}{2}\)
\(\left(x-\dfrac{1}{2}\right)\times\dfrac{5}{3}=\dfrac{10}{8}\)
\(\left(x-\dfrac{1}{2}\right)=\dfrac{10}{8}\div\dfrac{5}{3}\)
\(\left(x-\dfrac{1}{2}\right)=\dfrac{10}{8}\times\dfrac{3}{5}\)
\(\left(x-\dfrac{1}{2}\right)=\dfrac{3}{4}\)
\(x-\dfrac{1}{2}=\dfrac{3}{4}\)
\(x=\dfrac{3}{4}+\dfrac{1}{2}\)
\(x=\dfrac{5}{4}\)
x : 19832 - 7 = 4 : 2
x : 19832 - 7 = 2
x : 19832 = 9
x = 9 x 19832
x =178488
tick nha