26 + (5 + x) = 34
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(96-7\left(x+1\right)=14^4:14^3\)
\(\Rightarrow96-7\left(x+1\right)=14^{4-3}\)
\(\Rightarrow96-7\left(x+1\right)=14\)
\(\Rightarrow7\left(x+1\right)=96-14\)
\(\Rightarrow7\left(x+1\right)=82\)
\(\Rightarrow x+1=\dfrac{82}{7}\)
\(\Rightarrow x=\dfrac{82}{7}-1\)
\(\Rightarrow x=\dfrac{75}{7}\)
b) \(\left(5x+3^4\right)\cdot2^4=2^6\cdot7^2\)
\(\Rightarrow5x\cdot2^4+3^4\cdot2^4=2^6\cdot7^2\)
\(\Rightarrow5x\cdot2^4+6^4=\left(2^3\cdot7\right)^2\)
\(\Rightarrow80x+1296=3136\)
\(\Rightarrow80x=1840\)
\(\Rightarrow x=\dfrac{1840}{80}\)
\(\Rightarrow x=23\)
a: =>96-7(x+1)=14
=>7(x+1)=82
=>x+1=82/7
=>x=75/7
b =>5x+81=2^2*7^2=196
=>5x=115
=>x=23
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 5(x – 7) = 0
x – 7 = 0
x = 7
b, 95 – 5(x+2) = 45
5(x+2) = 40
x+2 = 8
x = 6
c, 6 2 x + 2 3 + 40 = 100
6(2x+8) = 60
2x+8 = 10
x = 1
d, 3(3x+9)+6 = 96
3(3x+9) = 90
3x+9 = 30
3x = 27
x = 9
e, 2 6 + 5 + x = 3 4
5+x = 81–64
5+x = 17
x = 12
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 13 x 5 x 2 = 13 x (5 x 2)
= 13 x 10
= 130
5 x 2 x 34 = (5 x 2) x 34
= 10 x 34
= 340
b) 2 x 26 x 5 = (2 x 5) x 26
= 10 x 26
= 260
a) 13 x 5 x 2 5 x 2 x 34 b) 2 x 26 x 5
= 13 x ( 5 x 2 ) = ( 5 x 2 ) x 34 = ( 2 x 5 ) x 26
= 13 x 10 = 10 x 34 = 10 x 26
= 130 = 340 = 260
Chúc bạn học tốt!
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(=2.125+5.375+7.15+6.85+7.5\)
=7,5+14+7,5
=15+14=29
b: \(\Leftrightarrow\left(\dfrac{4}{5}\cdot\dfrac{5}{6}+\dfrac{1}{5}\cdot x\right)\cdot30=60\)
=>(2/3+1/5x)=2
=>1/5x=2-2/3=4/3
=>x=4/3*5=20/3
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 13 x 5 x 2
= 13 x (5 x 2)
= 13 x 10 = 130
5 x 2 x 34
= (5 x 2 ) x 34
= 10 x 34 = 340
b) 2 x 26 x 5
= 26 x (2 x 5)
= 26 x 10 = 260
5 x 9 x 3 x 2
= (9 x 3) x (5 x 2)
= 27 x 10 = 270
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x+\left(-34\right)=\left(-26\right)+\left(-34\right)=-60\)
![](https://rs.olm.vn/images/avt/0.png?1311)
B3 a) x=4 b) x=-7 c) x=5 d) x=4
B2 a) -3+ -2+ -1+0+1+2+3+4=4
b) -6+ -5+ -4+ -3+ -2+ -1+0+1+2+3+4=-11
c) -18+-17+-16+-15+-14+-13+-12+-11+-10+-9+-8+-7+-6+-5+-4+3+-2+-1+0+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19=19
26 + (5 + x) = 34
64+(5+x)=81
5+x=81-64
5+x=17
x=17-5
x=12
Học tốt
26 + (5 + x) = 34
64 + 5 + x = 81
x = 81 - 64 - 5
x = 12