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d) 12x 156 - 12 x 55 - 12
= 12 x ( 156 - 55 - 12 )
= 12 x 100
= 1200
e ) 12 x 11 + 21 x 11 + 11 x 33
= ( 12+ 21 + 33) x 12
= 66 x 11
= 726
g) 132 x 11 - 11 x 32 - 54 x 11
= ( 132 - 32 - 54 ) x 11
= 46 x 11
= 506
d) 12 x 156 - 12 x 55 - 12 = 12x(156 - 55 - 1 ) = 12 x 100 = 1200
e) 12 x 11 + 21 x 11 + 11 x 33 = 11 x ( 12 + 21 + 33 ) = 11 x 66 = 726
g) 132 x 11 - 11 x 32 - 54 x 11 = 11 x ( 132 - 32 - 54 ) = 11 x 46 = 506
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\(=\dfrac{12}{15}\times\left(\dfrac{26}{11}-\dfrac{9}{11}-\dfrac{6}{11}\right)=\dfrac{12}{15}\times\dfrac{11}{11}=\dfrac{12}{15}=\dfrac{4}{5}\)
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\(=\dfrac{11}{12}\left(\dfrac{2}{7}+\dfrac{4}{7}+\dfrac{1}{7}\right)=\dfrac{11}{12}\cdot1=\dfrac{11}{12}\)
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Hướng dẫn giải:
a) 12 x 11 = 132
25 x 11 = 275
31 x 11 = 341
b) 83 x 11 = 913
58 x 11 = 638
79 x 11 = 869
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\(a)12\times11+28\times11+60\times11\)
\(=11\times\left(12+28+60\right)\)
\(=11\times100\)
\(=1100\)
\(b)11\times111\)
Ta thấy:
\(1+1=2\)
Thay \(2\) vào chữ số hàng chục và hàng trăm ta được:
\(11\times111=1221\)
Vậy \(11\times111=1221\)
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( 12 . 11 . x ) : 12 = 12
132 . x = 12 . 12
132 . x = 144
x = 144 : 132
x = \(\frac{12}{11}\)
~ Chúc học tốt ~
Ai ngang qua xin để lại 1 L - I - K - E
\(\left(12.11.x\right):12=12\)
\(\left(132.x\right):12=12\)
\(\left(132.x\right)=12.12\)
\(132.x=144\)
\(x=144:132\)
\(x=\frac{12}{11}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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1) \(\dfrac{11}{12}\times\dfrac{28}{13}-\dfrac{11}{12}\times\dfrac{15}{13}=\dfrac{11}{12}\times\left(\dfrac{28}{13}-\dfrac{15}{13}\right)=\dfrac{11}{12}\times\dfrac{13}{13}=\dfrac{11}{12}\times1=\dfrac{11}{12}\)
Vậy biểu thức trên có kết quả là : \(\dfrac{11}{12}\)
2) \(x+653=87\times11\)
\(x+653=957\)
\(x=957-653\)
\(x=304\)
Vậy `x = 304 `
3) \(\text{70 000 + 800 + 20 + 9}=70829\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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\(\frac{1}{9x10}\)\(+\frac{1}{10x11}\)\(+\frac{1}{11x12}\)\(+.....\)\(+\frac{1}{805x806}\)
\(=\frac{1}{9}\)\(-\frac{1}{10}\)\(+\frac{1}{10}\)\(-\frac{1}{11}\)\(+\frac{1}{11}\)\(-\frac{1}{12}\)\(+.....\frac{1}{805}\)\(-\frac{1}{806}\)
\(=\frac{1}{9}\)\(-\frac{1}{806}\)
\(=\frac{797}{7254}\)
12 x 11 = 132
Tk cho mk nha!
132 k nha