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a, ( y - 21 x 13 ) : 11 = 30
y - 273 = 30 x 11
y - 273 = 330
y = 330 + 273
y = 603
b, ( 627 - 138 ) : ( y : 2 ) = 163
489 : ( y : 2 ) = 163
y : 2 = 489 : 163
y : 2 = 3
y = 3 x 2 =6
c. 96 - ( 3,75 : y ) = 94,5
3,75 : y = 96 - 94,5
3,75 : y = 1,5
y = 3,75 : 1,5 = 2,5
d, 3,16 : ( y x 0,4 ) = 7,9
y x 0,4 = 3,16 : 7,9 = 0,4
y = 0,4 : 0,4 = 1
Tìm x :
(x - 21*13) : 11 = 30
(627 - 56,5) : (x: 2) = 163
2/3 + 1/3 : x = 1
165 - (35 : x + 3) * 15 = 15
a, ( x - 21 . 13 ) : 11 = 30
x - 273 = 30 . 11
x - 273 = 330
x = 330 + 273
x = 603
b, ( 627 - 56,5 ) : ( x : 2 ) = 163
570,5 : ( x : 2 ) = 163
x : 2 = 570,5 : 163
x : 2 = 3,5
x = 3,5 . 2
x = 7
c, 2/3 + 1/3 : x = 1
1/3 : x = 1 - 2/3
1/3 : x = 1/3
x = 1/3 : 1/3
x = 1
d, 165 - ( 35 : x + 3 ) . 15 = 15
165 - ( 35 : x + 3 ) = 15 : 15
165 - ( 35 : x + 3 ) = 1
35 : x + 3 = 165 - 1
35 : x + 3 = 164
35 : x = 164 - 3
35 : x = 161
x = 35 : 161
x = 5/23
Mk tính nhẩm nên chắc có chỗ sai nên bn cứ kiểm tra lại nha
(x - 21 x 13) : 11 = 30
=> x - 273 = 330
=> x = 603
vậy_
(627 - 138) : (x : 2) = 163
=> 489 : (x : 2) = 163
=> x : 2 = 3
=> x = 6
vậy_
\(\left(x-21.13\right):11=30\)
\(\left(x-273\right):11=30\)
\(\left(x-273\right)=30.11=330\)
\(x=330+273\)
\(x=603\)
(627 - 138) : (x : 2) = 163
489 : (x : 2) = 163
x : 2 = 489 : 163
x : 2 = 3
x = 3 x 2
x = 6
k mình nha
~Chúc các bạn học gioiỉ~
( 627 - 138 ) : ( X : 2 ) = 163
X : 2 = ( 627 - 138 ) : 163
X : 2 = 489 : 163
X : 2 = 3
X = 3 x 2
X = 6
(627-138):(m:2)=163
489:(m:2)=163
m:2=489:163
m:2=3
m=3x2
m=6
\(\left(\frac{2}{11\times13}+\frac{2}{13\times15}+\frac{2}{15\times17}+\frac{2}{17\times19}+\frac{2}{19\times21}\right)\times462-x=19\)
\(\left(\frac{1}{11}-\frac{1}{13}+\frac{1}{13}-\frac{1}{15}+...+\frac{1}{19}-\frac{1}{21}\right)\times462-x=19\)
\(\left(\frac{1}{11}-\frac{1}{21}\right)\times462-x=19\)
\(\frac{10}{231}\times462-x=19\)
\(20-x=19\)
\(\Rightarrow x=20-19=1\)
\(\dfrac{5}{13}\times\dfrac{7}{11}+\dfrac{5}{13}\times\dfrac{2}{11}+\dfrac{8}{13}\times\dfrac{9}{11}\)
\(=\dfrac{5}{13}\times\left(\dfrac{7}{11}+\dfrac{2}{11}\right)+\dfrac{8}{13}\times\dfrac{9}{11}\)
\(=\dfrac{5}{13}\times\dfrac{9}{11}+\dfrac{8}{13}\times\dfrac{9}{11}\)
\(=\dfrac{9}{11}\times\left(\dfrac{5}{13}+\dfrac{8}{13}\right)\)
\(=\dfrac{9}{11}\times1\)
\(=\dfrac{9}{11}\)
a) \(20,23\times21+20,23\times80-20,23\)
\(=20,23\times\left(21+80-1\right)\)
\(=20,23\times100\)
\(=2023\)
a, ( x - 21 x 13 ) : 11 = 39 Tich mk cau b) ti nua mk lam cho gio phai di hoc them rui
x - 273 = 39 x 11
x - 273 = 429
x = 429 + 273
x = 702
a, ( x - 21 x 13 ) : 11 = 39 b, ( x - 21 ) x 13 : 11 = 39
( x - 21 x 13 ) = 39 x 11 ( x - 21 ) x 13 = 39 x 11
( x - 21 x 13 ) = 429 ( x - 21) x 13 = 429
x - 273 = 429 ( x - 21 ) = 429 : 13
x = 429 + 273 ( x - 21 ) = 33
x = 702 x = 33 + 21
x = 54
\(\left(x-21.13\right):11=30\)
\(\left(x-273\right)=30.11\)
\(x-273=330\)
\(x=330+273\)
\(x=603\)
vậy \(x=603\)
\(\left(627-138\right):\left(x:2\right)=163\)
\(489:\frac{x}{2}=163\)
\(\frac{x}{2}=489:163\)
\(\frac{x}{2}=3\)
\(\Rightarrow x=6\)
vậy \(x=6\)
học tốt Trần Bích Ngọc
x = 603 .
x = 6 .