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a: =>(x-28):12=1/64
=>x-28=12/64=3/16
=>x=451/16
c: =>18:[(5x+130):x]=1
=>(5x+130):x=18
=>5x+130=18x
=>13x=130
hay x=10
a.
\(\left(3x-2^4\right)\times7^3=2\times7^4\)
\(3x-2^4=2\times7^4\div7^3\)
\(3x-16=2\times7\)
\(3x-16=14\)
\(3x=14+16\)
\(3x=30\)
\(x=\frac{30}{3}\)
\(x=10\)
b.
\(2130-\left(x+130\right)+72=-64\)
\(2130-\left(x+130\right)=-64-72\)
\(2130-\left(x+130\right)=-136\)
\(x+130=2130+136\)
\(x+130=2266\)
\(x=2266-130\)
\(x=2136\)
c.
\(15-\left(-x+18\right)=-24\)
\(\left(-x+18\right)=15+24\)
\(-x+18=39\)
\(-x=39-18\)
\(-x=21\)
\(x=-21\)
d.
\(10-\left|x+3\right|=-4-\left(-10\right)\)
\(\left|x+3\right|=10+4-10\)
\(\left|x+3\right|=4\)
\(x+3=\pm4\)
TH1:
\(x+3=4\)
\(x=4-3\)
\(x=1\)
TH2:
\(x+3=-4\)
\(x=-4-3\)
\(x=-7\)
Vậy x = 1 hoặc x = - 7.
a) (5x - 12 ) : 4 = 318 : 315
( 5x - 12 ) : 4 = 33
( 5x - 12 ) : 4 = 27
5x - 12 = 108
5x = 120
x = 24
b) 5x3 - 102 = 35
5x3 - 100 = 35
5x3 = 135
x3 = 27
x3 = 33
=> x = 3
c) 65 - 4x+2 = 20180
65 - 4x+2 = 1
4x+2 = 64
4x+2 = 43
x + 2 = 3
=> x = 1
d) 2x+1 - 2x = 32
2x . ( 2 - 1 ) = 32
2x . 1 = 32
2x = 32
2x = 25
=> x = 5
a) -10 - x + 5 + 3 - x = -8 suy ra 2x= -10+5+3+8 suy ra 2x= 6 suy ra x=3
b) 10 + 3x - 3 = 10 + 6x
suy ra 3x=3
suy ra x=1
SAi đề nhé. Cô viết lại như sau
S= 1-3+32 -33 + ...-399+3100
3.S= 3 - 32 + 33 - 34 + ...- 3100+3101
S + 3S= 1+3101
4S = 1+3101
suy ra S=(1+3101):4
\(\left(72.10^3+18.10^3\right)-\left(5x+3.10^3\right)=2.10^3\)
\(10^3.\left(72+18\right)-5x-3.10^3=2.10^3\)
\(10^3.90-5x-3000=2000\)
\(10^3.90-5x=5000\)
\(90000-5x=5000\)
\(5x=85000\)
\(x=17000\)
102.18:[(5x+130):x]=100
1800:((5x
=>100.18:[(5x+130):x]=100
=>1800:[(5x+130):x]=100
=>(5x+130):x=1800:100=18
=>5x:x+130:x=18
=>\(\frac{5x}{x}+\frac{130}{x}=18=>\frac{5x+130}{x}=18=>5x+130=18x=>18x-5x=130\)
=>13x=130=>x=10