Rút gọn A = 76 - |x - 78| - |78 - x|
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a,= 32.(11+67) +78.68
32.78+78.68
78.(32+68)
78.100
= 7800
b,76.(41-20)+21.24
=76.21+21.24
=21.(76+24)
=21.100
=2100
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a ) x = − 91 60 . b ) x = − 8 9 . c ) x = 35 19 . d ) x = 3 7 .
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\(\dfrac{72}{78}=\dfrac{72:6}{78:6}=\dfrac{12}{13}\)
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\(\dfrac{2^{76}-2^{74}}{2^{78}-2^{76}}=\dfrac{2^{74}\left(2^2-1\right)}{2^{76}\left(2^2-1\right)}=\dfrac{1}{2^2}=\dfrac{1}{4}\)
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a, 25+35+76+65+22
=(65+35)+(76+22)+25
=100+100+25
=225
c , 78-23-25
=78-(23+25)
=78-48
=30
a , x-45=20
x=20+45
x=65
b , 45 - x=20
x =45-20
x= 25
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a , 25 + 35 + 76 +65 + 22
= 25+(35+65)+(76+22)
=25+100+100
=225
b , 24 + 25 + 24 x 22
=24(1+22)+25
=552+25
=577
c , 78 - 23 - 25
=78-(23+25)
=78-48
=30
![](https://rs.olm.vn/images/avt/0.png?1311)
a: Ta có: 24+35+76+65+22
=(24+76)+(35+65)+22
=222
b: Sửa đề: \(24\cdot35+24\cdot65\)
=24x100
=2400
A = 76 - |x - 78| - |78 - x|
A = 76 - 2.|x - 78|
A = 76 - 2.(x - 78)
A = 76 - 2x + 156
A = 232 - 2x
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