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( 3x - 2 mũ 4 ) . 7 mũ 3 = 2 . 7 mũ 4
5x-2 - 3 mũ 2 = 2 mũ 4 - ( 2 mũ 1 . 2 mũ 4 - 2 mũ 10. 2 mũ 2 )
\(\left(3x-2^4\right)\cdot7^3=2\cdot7^4\)
\(3x-2^4=7^4\cdot2:7^3=7\cdot2=14\)
\(3x-16=14\)
\(3x=14+16=30\)
\(x=\frac{30}{3}=10\)
vậy x=10
a) \(\left(12x-4^3\right).8^3=4.8^4\)
\(12x-4^3=32\)
12x = 96
x = 8
b) \(\left(3x-2^4\right).7^3=2.7^4\)
3x - 24 = 14
3x = 30
x = 10
1; 73.52.54.76:(55.78)
= (73.76).(52.54) : (55.78)
= 79.56: (55.78)
= (79:78).(56:55)
= 7.5
= 35
2; 33.a7.3.a2:(34.a6)
= (33.3).(a7.a2): (34.a6)
= 34.a9: (34.a6)
= (34:34).(a9:a6)
= a3
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\(\left(3x-2^4\right).7^3=2.7^4\)
\(\Rightarrow\left(3x-2^4\right)=2.7^4:7^3=14\)
\(\Rightarrow\)\(3x=14+16=30\)
\(\Rightarrow x=30:3=10\)
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\(\left(3x-2^4\right)\cdot7^3=2\cdot7^4\)
\(=\left(3x-16\right)\cdot343=2\cdot2401\)
\(=\left(3x-16\right)\cdot343=4802\)
\(=\left(3x-16\right)=4802:343\)
\(=\left(3x-16\right)=14\)
\(=3x=14+16=30\)
Vậy:\(x=30:3=10\)