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a) 15x = -75
\(\Rightarrow\)x = - 75 : 15
\(\Rightarrow\)x = - 5
b) 3|x| = 18
\(\Rightarrow\)|x| = 18 : 3
\(\Rightarrow\)|x| = 6
\(\orbr{\begin{cases}x=6\\x=-6\end{cases}}\)
114 x 75 x 204 : 25 : 102 : 4
= 114 x 75 x 204 : ( 25 x 4 x 102 )
= 114 x 75 x 204 : 10200
= 1744200 : 10200
=171
hok tốt .
\(1,5\times3,2\times x-0,6=2,25\) \(\Leftrightarrow1,5\times3,2\times x=2,25+0,6\) \(\Leftrightarrow1,5\times3,2\times x=2,85\) \(\Leftrightarrow3,2\times x=2,85:1,5\) \(\Leftrightarrow3,2\times x=1,9\) \(\Leftrightarrow x=1,9:3,2\) \(\Leftrightarrow x=0,59375\)
4x - 15 = - 75 - x
=> 4x + x = - 75 + 15
=> 5x = - 60
=> x = - 12
vậy_
72 - 3x = 5x + 8
=> - 3x - 5x = 8 - 72
=> - 8x = - 64
=> x = 8
vậy_
\(4x-15=-75-x\)
\(\Leftrightarrow4x+x=-75+15\)
\(\Leftrightarrow5x=-60\Leftrightarrow x=-12\)
\(20⋮\left(x-4\right)\)
\(\left(x-4\right)\inƯ\left(20\right)=\left\{-20;-10;-5;-4;-1;1;4;5;10;20\right\}\)
x-4 | -20 | -10 | -5 | -4 | -1 | 1 | 4 | 5 | 10 | 20 |
x | -16 | -6 | -1 | 0 | 3 | 5 | 9 | 13 | 14 | 24 |
\(16⋮\left(x+1\right)\Rightarrow\left(x+1\right)\inƯ\left(16\right)=\left\{-16;-4;-1;1;4;16\right\}\)
x+1 | -16 | -4 | -1 | 1 | 4 | 16 |
x | -17 | -5 | -2 | 0 | 3 | 15 |
\(75⋮\left(2x+1\right)\)
\(\Rightarrow\left(2x+1\right)\inƯ\left(75\right)=\left\{-75;-15;-5;-1;1;5;15;75\right\}\)
2x+1 | -75 | -15 | -5 | -1 | 1 | 5 | 15 | 75 |
2x | -76 | -16 | -6 | -2 | 0 | 4 | 14 | 74 |
x | -38 | -8 | -3 | -1 | 0 | 2 | 7 | 37 |
\(xy+x+y=5\Rightarrow10x+y+x+y=5\)
\(\Rightarrow11x+2y=5\)
Rồi bạn tự giải nốt nha!
Mik nhầm.
Phải là
\(xy+x+y=5\Rightarrow x\left(y+1\right)+y=5\Rightarrow x\left(y+1\right)+\left(y+1\right)=5+1\)
\(\Rightarrow\left(y+1\right)\left(x+1\right)=6\)
Sau khi lập bảng, ta có:
\(\left(x;y\right)=\left\{\left(-1;-6\right),\left(-6;-1\right),\left(1;6\right),\left(6;1\right),\left(-3;-2\right),\left(3,2\right),\left(-2;-3\right),\left(2;3\right)\right\}\)
=Xx10-(10+9+8+...+2+1) =20-15
=Xx10-(10+9+8+...+2+1) =5
Xx10-55 =5
Xx10=55+5
Xx10=60
X =60:10
X=6
(x-1) + (x-2)+(x-3)+ ....+(x-9)+(x-10) = -20-15
(x+x+x+...+x) - (1+2+3+4+...+9+10) = -35
=> 10x -55 = -35
=> 10x = -35 +55
=>> 10x = 20
=> x = 20 : 10
=> x = 2
a) 48 x 9 + 24 x 18 + 18 x 52
= 24 x 2 x 9 + 24 x 18 + 18 x 52
= 24 x 18 + 24 x 18 + 18 x 52
= 18 x (24+24+52)
=18 x 100
=1800
a﴿ 48 x 9 + 24 x 18 + 18 x 52
= 24 x 2 x 9 + 24 x 18 + 18 x 52
= 24 x 18 + 24 x 18 + 18 x 52
= 18 x ﴾24+24+52﴿
=18 x 100
=1800
75%x + x = 1,5
=> 3/4x + x = 1,5
=> 7/4x = 1,5
=> x = 1,5 : 7/4
=> x = 6/7
x(75%+1)=1,5
x1,75=1,5
x=1,5/1,75