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a) \(58+7x=100\)
\(=>7x=100-58\)
\(=>7x=42\)
\(=>x=42:7\)
\(=>x=6\)
b) \(3x-7=28\)
\(=>3x=28+7\)
\(=>3x=35\)
\(=>x=35:3\)
\(=>x=\dfrac{35}{3}\)
c) \(x-56:4=16\)
\(=>x-14=16\)
\(=>x=16+14\)
\(=>x=30\)
d) \(101+\left(36-4x\right)=105\)
\(=>36-4x=105-101\)
\(=>36-4x=4\)
\(=>4x=36-4\)
\(=>4x=32\)
\(=>x=32:4\)
\(=>x=8\)
e) \(\left(x-12\right):12=12\)
\(=>x-12=12.12\)
\(=>x-12=144\)
\(=>x=144-12\)
\(=>x=132\)
f) \(\left(3x-2^4\right).7^3=2.7^4\)
\(=>3x-2^4=2.7^4:7^3\)
\(=>3x-16=2.7=14\)
\(=>3x=14+16\)
\(=>3x=30\)
\(=>x=30:3\)
\(=>x=10\)
i) \(\left(10+2x\right).4^{2011}=4^{2013}\)
\(=>10+2x=4^{2013}:4^{2011}\)
\(=>10+2x=4^2=16\)
\(=>2x=16-10\)
\(=>2x=6\)
\(=>x=6:2\)
\(=>x=3\)
\(#WendyDang\)
a)
\(13x+3=16\\ 13x=16-3\\ 13x=13\\ x=13:13\\ x=1\)
b)
\(2x-138=2^4:2^3\\ 2x-138=2\\ 2x=2+138\\ 2x=140\\ x=140:2\\ x=70\)
a)
13x+3=16
13x =16−3
13x =13
x =13:13
x=1
b)
2x−138=2^4:2^3
2x−138=2
2x =2+1382
x =140
x =140:2
x =70
\(\left(5x-24\right).73=2.74\)
\(\Leftrightarrow\left(5x-24\right).73=148\)
\(\Leftrightarrow5x-24=\frac{148}{73}\)
\(\Leftrightarrow5x=\frac{148}{73}+24\)
\(\Leftrightarrow5x=\frac{1900}{73}\)
\(\Leftrightarrow x=\frac{1900}{73}.\frac{1}{5}\)
\(\Leftrightarrow x=\frac{380}{73}\)
a. x-36:18=12-15 b.(3x-2^4).7^3=2.7^4 3x-16=14 x-36 =-3 3x-2^4 =2.7^4:7^3 3x =16+14 x =-3+36 3x-16 =2.7^4-3 3x =30 x =33 3x-16 =2.7 3x =30:3 =10
a)
x-36:18=12-15
<=> x-2=-3
<=> x= -1
Vậy x= -1
b)
(3x- 2^4).7^3=2.7^4
<=> 3x-2^4= 2.7^4:7^3
<=> 3x-16= 2.7
<=> 3x-16= 14
<=> 3x= 30
<=> x=10
Vậy x=10