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ý mình là c/m như thế nào cơ? Bạn làm đầy đủ cho mình nhé!
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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
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Bài 2:
a: =>x-45=-20
hay x=25
b: =>35+30-5x=-12+112
=>65-5x=100
=>5x=-35
hay x=-7
c: =>x-124=1000
hay x=1124
d: \(\Leftrightarrow46-\left(3x-2\right)^3=-18\)
\(\Leftrightarrow\left(3x-2\right)^3=64\)
=>3x-2=4
hay x=2
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
a: =>x-45=-20
hay x=25
b: =>35+30-5x=-12+112=100
=>65-5x=100
=>5x=-35
hay x=-7
c: =>x-124=1000
hay x=1124
d: \(\Leftrightarrow46-\left(3x-2\right)^3=-18\)
\(\Leftrightarrow\left(3x-2\right)^3=64\)
=>3x-2=4
hay x=2
![](https://rs.olm.vn/images/avt/0.png?1311)
a,37 + 42 - 37 + 22 = 42 - 22 = 20
b,4^4 : 8 + 2^3 . 11
= 2^8 : 2^3 + 2^3.11
= 2^5 + 2^3.11
= 32 + 8.11
= 32 + 88
= 120
c, 6250 : {50^2:[112-(32-2^2.5)]}
= 6250 : {2500 : [ 112 - ( 32 - 4 .5 )]}
= 6250 : { 2500 : [ 112 - 12 ]}
=6250 : { 2500 : 100 }
= 6250 : 25
=250
a,37 + 42 - 37 + 22
Nhận xét : 37 - 37 = 0 còn 42 - 22 = 20
![](https://rs.olm.vn/images/avt/0.png?1311)
a)1+2+3+...+99+100=(100+1).100:2=5050
b)22+24+26+...+100+112=(22+112).46:2=3082
a) SSH: (100-1):1+1=100
Tổng: (100+1)x100:2=5050
b) SSH: (112-22):2+1=46
Tổng: (112+22)x46:2=3082
58-(32:(112-32x22))
=58-(32:(112-36))
=58-(32:76)
\(=58-\frac{8}{19}\)
=\(\frac{1102-8}{19}\)
=\(\frac{1094}{19}\)
57,57894737