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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: \(8\cdot6+288:\left(x-3\right)^2=50\)
\(\Leftrightarrow288:\left(x-3\right)^2=50-48=2\)
\(\Leftrightarrow\left(x-3\right)^2=144\)
\(\Leftrightarrow\left[{}\begin{matrix}x-3=12\\x-3=-12\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=15\\x=-9\end{matrix}\right.\)
a, 450 - 5x = 75
5x = 450 - 75
5x = 375
x = 75
Vậy...
b, ( 450 - 5x ) . 15 = 75
450 - 5x = 5
5x = 445
x = 89
Vậy ...
c, ( 450 - x ) : 15 = 150
450 - x = 2250
x = 450 - 2250
x = -1800
Vậy...
a) 450 -5 x X =75 b) ( 450 - 5 x X ) x15 =75 c) ( 450 - X ) : 15 =150
5 x X =450-75 450 - 5 x X =75 : 15 450 - X =150x15
5 x X =375 450 - 5 x X =5 450 - X =2250
X=375:5 5 x X =450:5 X =450-2250
X=75 5 x X =90 X =-1800
X =90:5
X =18
a) 175 - (4 - x) : 3 = 95
=> (4 - x) : 3 = 175 - 95
=> (4 - x) : 3 = 80
=> 4 - x = 80 . 3
=> 4 - x = 240
=> x = 4 - 240
=> x = -236
Vậy x = -236
b) (3x - 5) - 14 = 71
=> 3x - 5 = 71 + 14
=> 3x - 5 = 85
=> 3x = 85 + 5
=> 3x = 90
=> x = 90 : 3
=> x = 30
Vậy x = 30
Bài 1:
a) a = 45, b = 175, c = -130
a - b - c = 45 - 175 - (-130) = 45 - 175 + 130 = -260
b) a = -350, b = -285, c = -85
a - b - c = (-350) - (-285) - (-85) = -350 + 285 + 85 = 20
c) a = -720, b = -370, c = -380
a - b - c = (-720) - (-370) - (-380) = -720 + 370 + 380 = 30
A = 4 . 2 . 25 . 5 . 175
A = 22 . 2 . 52 . 5 . 52 . 7
A = 22+1 . 52+1+2 . 7
A = 23 . 55 .7
A = 175000
\(B=4^2-10^4:\left(50\cdot273-50\cdot73\right)\)
\(B=4^2-10^4:\left[50\cdot\left(273-73\right)\right]\)
\(B=4^2-10^4:\left(50\cdot200\right)\)
\(B=4^2-10^4:10^4=4^2-1=15\)
\(C=3\times53\times6+2\times9\times87-18\times40\)
\(C=18\times53+18\times87-18\times40\)
\(C=18\times\left(53+87-40\right)\)
\(C=18\times100=1800\)
a)17-(12+13)
=17-25
=-8
b)2347-450-347-550
=(2347-347)-(450+550)
=2000-1000
=1000
c)(-71).(-175)-75.71
=71.(175-75)
=71.100
=7100
d)93.(27-100)+(-3)^3.93
=93.(27-100)+(-27).93
=93.((-27)+(-73))
=93.(-100)
=-9300
bài 2 :
a)x-15=-20
x=-20+15
x=-5
b)3x+27=6
3x=6-27
3x=-21
x=-21:3
x=-7
c)3.(x-1)+27=102
3.(x-1)=102-27
3.(x-1)=75
x-1=75:3
x-1=25
x=25+1
x=26
d)|x-6|.7-(-2)^2=-8+39
sory ,câu này mk ko làm đc
a) \(175-\left(42:x+95\right)=3\)
\(\Rightarrow42:x+95=172\)
\(\Rightarrow42:x=77\)
\(\Rightarrow x=42:77\)
\(\Rightarrow x=\dfrac{6}{11}\)
b) \(450:\left(75-13\cdot x\right)=10\)
\(\Rightarrow75-13\cdot x=450:10\)
\(\Rightarrow75-13\cdot x=45\)
\(\Rightarrow13\cdot x=75-45\)
\(\Rightarrow13\cdot x=30\)
\(\Rightarrow x=\dfrac{30}{13}\)