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Mình xin giải như sau:
a)15x-57=3^14:3^9
15.x-57=3^5
15.x-57=243
15.x=243+57
15.x=300
x=300:15
x=20
b)50-[70:(x-1)]=15
70:(x-1)=50-15
70:(x-1)=35
x-1=70:35
x-1=2
x=2+1
x=3
c) (5^2+2^3).x+4^2=7^2
(25+8).x+16=49
33.x=49-16
33.x=33
x=33:33
x=1
d) 2^x:2^5=1
2^x=1.2^5
2^x=2^5
Suy ra x=5
18-(x-2)^5=2.3^2
18-(x-2)^5=2.9
18-(x-2)^5=18
(x-2)^5=18-18
(x-2)^5=0
x=0+2
x=2
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Em 2k9 , e chỉ đc học sơ qua thôi nha
5 x (X-3) + 32 = 52 x 2 - 6
=>5x(x-3)+9= 25x 2-6
=>5x(x-3)+9=44
=> 5x(x-3) = 35
=>x-3= 7
=>x =10
a)5 x (X-3)+32=52 x 3-6
5 x (X-3)+9=25 x 3-6
5 x (X-3)+9=75-6
5 x (X-3)+9=69
5 x (X-3)=69-9=60
X-3=60:5=12
X=12+3=15
b)57 x 35 +23 x 57 + 58 x 43
=57 x 35 +23 x 57 +(57+1) x 43
=57 x 35 +23 x 57 +57 x 43 + 43
=57 x (35+23+43)+43
=57 x 101 + 43
=57 x (100+1)+43
=57 x 100 +57 +43
=5700 + 100=5800
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Câu 1:
9.x-8=16+57
9.x-8=73
9.x=73+8
9.x=81
x=81:9
x=9
Câu 2:
16.x+9.x=30+20
(16+9).x=50
25.x=50
x=50:25
x=2
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Bài 1 :
a, Ta có : \(\left(-123\right)+\left|-13\right|+\left(-7\right)\)
= \(\left(-123\right)+13+\left(-7\right)=\left(-117\right)\)
b, Ta có : \(\left|-10\right|+\left|45\right|+\left(-\left|-455\right|\right)+\left|-750\right|\)
= \(10+45-455+750=350\)
c, Ta có : \(-\left|-33\right|+\left(-15\right)+20-\left|45-40\right|-57\)
= \(\left(-33\right)+\left(-15\right)+20-5-57=-90\)
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x - 2.32 : 3 = 12
=> x - 18 : 3 = 12
=> x - 6 = 12
=> x = 6 + 12 = 18