Gíup mình với:Thực hiện phép tính:a)3.52-16:22b)23.17-23.14c)15.141+59.15d)20-/30-(5-1)2/ /:là ngoặc vuông nha.
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Bài 3:
a)3.52-16:22=71
b)15.141+59.15=15(141+59)=3000
c)23.17-23.14=23(17-14)=8.3=24
(câu b hình như thiếu dấu "+"?)
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`a, 3.5^2 -16:2^2`
`= 3. 25 - 16:4`
`= 75 - 4`
`=71`
_____
`b, 15.141 +59 . 15`
`= 15. (141+59)`
`=15. 200`
`=3000`
______
`c, 2^3 . 17 - 2^3 .14`
`= 2^3 . (17-14)`
`= 8 . 3`
`=24`
a: =3^7*3^15*3^12=3^34
b: =(36:18)^5=2^5=32
c: =5^7-5^5=5^5(5^2-1)=5^5*24=75000
d: =5^12:5^8=5^4=625
![](https://rs.olm.vn/images/avt/0.png?1311)
b: \(=15\left(141+19\right)=15\cdot160=24000\)
c: \(=2^3\cdot\left(17-14\right)=8\cdot3=24\)
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a, 3 . 5 2 - 16 : 2 2 = 3.25 - 16:4 = 75 - 4 = 71
b, 15.141 + 59.15 = 15.(141+59) = 15.200 = 3000
c, 2 3 . 17 - 2 3 . 14 = 8.17 - 8.14 = 8.(17 - 14) = 8.3 = 24
d, 20 - 30 - 5 - 1 2 = 20 - 30 - 4 2 = 20 - (30 - 16) = 20 - 14 = 6
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15.141+59.15=2115+885=3000
20-[30-(5-12)]=20-[30-(5-1)]=20-[30-4)]=20-26=.....chỗ này đề bài sai nha bn
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Bài 3:
a: Ta có: 60-3(x-2)=51
\(\Leftrightarrow x-2=3\)
hay x=5
b: Ta có: \(4x-20=25:2^2\)
\(\Leftrightarrow4x=\dfrac{25}{4}+20=\dfrac{105}{4}\)
hay \(x=\dfrac{105}{16}\)
c: Ta có: \(8\cdot6+288:\left(x-3\right)^2=50\)
\(\Leftrightarrow288:\left(x-3\right)^2=50-48=2\)
\(\Leftrightarrow\left(x-3\right)^2=144\)
\(\Leftrightarrow\left[{}\begin{matrix}x-3=12\\x-3=-12\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=15\\x=-9\end{matrix}\right.\)
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a: 3*5^2-16:2^2
=3*25-16:4
=75-4=71
b: =2^3(17-14)
=8*3
=24
c: =15(141+59)
=15*200
=3000
d: =17(85+15)-200
=1700-200
=1500
f: =3+2^5
=3+32
=35
g: =42(39-37):42
=39-37
=2
![](https://rs.olm.vn/images/avt/0.png?1311)
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