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1) 673+x=3x-(x-12)
673+x=3x-x+12
673+x=2x+12
673+x-2x-12=0
661-x=0
x=661
2)25-(x-27)=-18-(x-9)
25-x+27=-18-x+9
52-x=-9-x
52-x+9+x=0
61=0(vô lý)
3)x-(20-x)=36
x-20+x=36
2x=36+20
2x=56
=> x=28
4)x-(-18-2x)=-33
x+18+2x=-33
3x+18=-33
3x=-33-18
3x=-51
=> x=-17
\(120-\left\{17^{18}:17^{17}+2^2.\left[3.\left(21^{27}:21^{20}-5.3^3\right)\right]\right\}\)
\(=120-\left[17+4:\left(3.1801088406\right)\right]\)
\(=120-\left(17+4:5403265218\right)\)
\(=120-17\)
\(=103\)
học tốt
\(a.x+\left(x+10\right)+\left(x+14\right)+....+\left(x+162\right)=3434\\ x+\left(x+x+.....+x\right)+\left(10+14+18+.....+162\right)=3434\\ x+x+39+3354=3434\\ x\cdot40=80\\ x=2\)
A= 2/5 - 1
= -3/5
B= -30/24 + 4/24 - 36/24
= 31/12
A = 3/7 x 2x7/3x5 - 3x6/7x3 x 7/6 = 2/5 - 3/3 = 2/5 - 5/5 = -3/5
B=1/6 - (5/4 + 3/2) = 1/6 -(5/4 + 6/4)= 1/6 - 11/4 = 2/12 - 33/12 = - 21/12
(-18)+(-31)+98+|-18|+(-69)
= - 18 - 31 + 98 + 18 - 69
= -2
hok tốt!!
a,\(27-\left\{-x-\left[-x-\left(-x\right)\right]\right\}=-18\)
\(=>\left\{-x-\left[-x+x\right]\right\}=27-\left(-18\right)\)
\(=>\left\{-x+x-x\right\}=27+18\)
\(=>-x=45\)
\(=>x=-45\)
\(b,x+\left\{\left(x+3\right)-\left[\left(x+3\right)-\left(-x-2\right)\right]\right\}=x\)
\(=>\left\{\left(x+3\right)-\left[x+3+x+2\right]\right\}=x-x\)
\(=>\left\{x+3-x-3-x-2\right\}=0\)
\(=>-x-2=0\)
\(=>-x=2=>x=-2\)
x-14=3x+18
-14-18=3x-x
-32=2x
x=-32:2
x=-16
vậy x=-16
x-14=3x +18
=> x - 3x = 18 + 14
=> -x2 = 32
=> -x = 16
=> x = -16
vậy x = -16
18-(x+14):3=27
(x+14):3=18-27
(x+14):3= -9
(x+14)= -9 nhân 3
x+14= -27
x= -27 -14
x= -41