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a/ 2130-(x+130)+72=-64
\(2130-\left(x+130\right)=-64-72\) \(2130-\left(x+130\right)=-136\)\(x+130=2130+136\)\(x+130=2266\)\(x=2266-130\)\(x=2136\)vậy x=2136
a/ 2130-(x+130)+72=-64
<=> -x-130+72+2130=-64
<=> x=2130+72-130+64=2136
b/135-|9-x|=35
<=> |9-x|=135-35=100
<=> \(\left[\begin{array}{nghiempt}9-x=100\\9-x=-100\end{array}\right.\)
<=>\(\left[\begin{array}{nghiempt}x=-91\\x=109\end{array}\right.\)
c/10-|x+3|=-4-(-10)
<=> |x+3|=10+4+(-10)
<=>|x+3|=4
<=>\(\left[\begin{array}{nghiempt}x+3=4\\x+3=-4\end{array}\right.\)
<=>\(\left[\begin{array}{nghiempt}x=1\\x=-7\end{array}\right.\)
N=\(\dfrac{2^{10}.13+2^9+130}{2^8.104}\)
N=\(\dfrac{13312+642}{26624}\)
N=\(\dfrac{3954}{26624}\)=\(\dfrac{6977}{13312}\)
2130-(x+130)+72=-64
2130-(x+130)=-64-72
2130-(x+130)=-136
x+130=2130-(-136)
x+130=2130+136=2266
x=2266-130
x=2136
b)x-(-x+15)=17
=>x+x-15=17
=>2x-15=17
=>2x=17+15=32
x=16
đúng thì ****
a) 2130 - ( x + 130 ) + 72 = -64
( x + 130 ) + 72 = 2130 - -64
( x + 130 ) + 72 = 2194
( x + 130 ) = 2194 - 72
x + 130 = 2122
x = 2122 - 130
x = 1992
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.
12 { [ 18 - ( 6 : x + 3 ) ] - 3 } = 130 - 10 = 120
18 - ( 6 : x + 3 ) - 3 = 120 : 12 = 10
18 - ( 6 : x + 3 ) = 10 + 3 = 13
6 : x + 3 = 18 - 13 = 5
6 : x = 5 - 3 = 2
x = 6 : 2 = 3
Vậy x = 3
130 - 12{[18 - (6 : x + 3)] - 3} = 10
12{[18 - (6 : x + 3)] - 3} = 130 - 10
12{[18 - (6 : x + 3)] - 3} = 120
18 - (6 : x + 3) - 3 = 120 : 12
15 - (6 : x + 3) = 10
6 : x + 3 = 15 - 10
6 : x + 3 = 5
6 : x = 5 - 3
6 : x = 2
x = 6 : 2
x = 3
Vậy x = 3
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
=>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
2x-15=25
2x=25+15
2x=40
x=40:2
x=20
x-8=96
x=96+8
x=104
120-(x-3)=35
x-3=120-35
x-3=85
x=85+3
x=88
35-5(x-2)=15
5(x-2)=35-15
5(x-2)=20
x-2=20:5
x-2=4
x=4+2
x=6
(x-9)-20=19
x-9=19+20
x-9=39
x=39+9
x=48
782:(216-x-3)=15
hik như câu này đề lỗi
130-30(x-2)=10
30(x-2)=130-10
30(x-2)=120
x-2=120:30
x-2=4
x=4+2
x=6
chúc bạn học tốt nha
ủng hộ mk bằng cách tk nha
\(130-3\left(10+x\right)=25.\)
\(\Leftrightarrow130-30-3x=25.\)
\(\Leftrightarrow100-3x=25.\Leftrightarrow3x=75.\Leftrightarrow x=25.\)
Vậy \(x=25\) là nghiệm của phương trình.
130-3.(10+x)=25
3.(10+x)=130-25
3.(10+x)=105
(10+x)=105:3
10+x =35
x=35-10=25