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![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(61\cdot45+61\cdot23-68\cdot51\)
\(=61\left(45+23\right)-68\cdot51\)
\(=68\cdot61-68\cdot51\)
\(=68\left(61-51\right)=68\cdot10=680\)
b: \(3\cdot5^2-\left(75-4\cdot2^3\right)\)
\(=75-75+4\cdot8\)
\(=4\cdot8=32\)
c: \(36:\left\{2^2\cdot5-\left[30-\left(5-1\right)^2\right]\right\}\)
\(=\dfrac{36}{20-30+4^2}\)
\(=\dfrac{36}{-10+16}=\dfrac{36}{6}=6\)
d: \(\left(12\cdot49-3\cdot2^2\cdot7^2\right):\left(2020\cdot2021\right)\)
\(=\dfrac{\left(12\cdot49-12\cdot49\right)}{2020\cdot2021}=0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
b: =39(113+87)=39x200=7800
c: =8(15+35)=8x50=400
d: \(=\left(600-8-3\cdot125\right):5=\dfrac{217}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(3.5^2+15.2^2-26\div2\)
= 3.25 + 15.4 - 13
= 75 + 60 - 13
= 135 - 13
= 122
b) \(5^3.2-100\div4+2^3.5\)
= 125.2 - 25 + 8.5
= 250 - 25 + 40
= 225 + 40
= 265
c)\(6^2\div9+50.2-3^3.33\)
= 36 : 9 + 100 - 9.33
= 4 + 100 - 297
= 104 - 297
= -193
d)\(3^2.5+2^3.10-81\div3\)
= 9.5 + 8.10 - 27
= 45 + 80 - 27
= 125 - 27
= 98
e) \(5^{13}\div5^{10}-25.2^2\)
= 53 - 25.4
= 125 - 100
= 25
f) \(20\div2^2+5^9\div5^8\)
= 20 : 4 + 5
= 5 + 5
= 10
a) 36 . 68 + 68 . 64
= 68 . ( 36 + 64 )
= 68 . 100
= 6800
b) 39 . 113 + 87 . 39
= 39 . ( 113 + 87 )
= 39 . 200
= 7800
c) 22 . 15 + 23 . 35
= 4 . 15 + 8 .35
= 60 + 280
= 340
d) [ 600 - ( 40 : 23 + 3. 53 ) ] : 5
= [ 600 - ( 40 : 8 + 3 . 125 ) ] : 5
= [ 600 - ( 5 + 375 ) ] : 5
= [ 600 - 380 ] : 5
= 220 : 5
= 44
a= 6800
b=7800
c=200
d= 329/3
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