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a) 3x52+15x22-26:3
=3x25+15x4-26/3
=75+60-26/3
=135-26/3
=379/3
b) 53x2-100:4+23x5
=125x2-25+8x5
=250-25+40
=225+40
=265
B1
B = 52 . 4 - ( 18 + 6 . 7 ) : 81 : 33
= 25 . 4 - ( 18 + 42 ) : 34 : 33
= 100 - 60 : 3
= 100 - 20
= 80
B2
5x+1 + 52 = 62 + ( 79 : 77 - 23 )
=> 5x+1 + 52 = 36 + ( 72 - 8 )
=> 5x+1 + 52 = 36 + 41
=> 5x+1 + 52 = 77
=> 5x+1 = 25
=> 5x+1 = 52
=> x + 1 = 2
=> x = 1
\(+)18⋮x-3\)
\(\Rightarrow x-3\inƯ\left(18\right)\)
mà \(Ư\left(18\right)=\left\{1;2;3;6;9;18\right\}\)
\(\Rightarrow\hept{\begin{cases}x-3=1;x-3=6\\x-3=2;x-3=9\\x-3=3;x-3=18\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=4;x=9\\x=5;x=12\\x=6;x=21\end{cases}}\)
\(26⋮\left(x+1\right)\)
\(\Rightarrow\left(x+1\right)\inƯ\left(26\right)\)
mà \(Ư\left(26\right)=\left\{1;2;13;26\right\}\)
\(\Rightarrow\orbr{\begin{cases}x+1=1\\x+1=2\end{cases}}\orbr{\begin{cases}x+1=13\\x+1=26\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=0\\x=1\end{cases}}\orbr{\begin{cases}x=12\\x=25\end{cases}}\)
a, 3.5^2+15.2^2-26:2
=3.25+15.4-13
=75+60-13
=135-13
=122
b, 5^3.2-100:4+2^3.5
=125.2-25+8.5
=250-25+40
=225+40
=265
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, 53.(-15)+(-15).47
=(-15)(53+47)
=(-15).100
=-1500
b, 43.(53-81)+53.(81-43)
=43.(-28)+53.38
=810
c,(-5).8+53.(81-43)
=-45+53.38
=1969
d, ban tu giai nốt
a,-15 . (53+47)
= -15 . 100
=-1500
b,43.53-43.81+53.81-43.53
=(43.53-43.53)+81.(-43+53)
= 0 + 81.10
=0+810
=810
c,-40+-8
=-48
d,3.16+(-10)-20
=48+(-10)-20
=38-20
=18
a) 3 x 52 + 15 x 22 - 26 : 2
= 3 x 25 + 15 x 4 - 13
= 75 + 60 - 13
= 135 - 13
= 122
b) 53 x 2 - 100 : 4 + 23 x 3
= 125 x 2 - 25 + 8 x 3
= 250 - 25 + 24
= 225 + 24
= 249
c) 32 : 5 + 23 x 10 - 81 : 3
9 : 5 + 8 x 10 - 27
= 1,8 + 80 - 27
= 81,8 - 27
= 54,8