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\(B=5.3^2+4.3^2=3^2\left(5+4\right)=9.9=9^2\)
\(C=5^3+6^3+59=125+216+59=400=20^2\)
\(D=5.4^3+2^4.5+41=320+80+41=441=21^2\)
b: \(5\cdot3^2+4\cdot3^2=3^2\cdot9=3^4\)
c: \(5^3+6^3+59=20^2\)
\(5\cdot4^3+2^4\cdot5+41=21^2\)
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Lời giải:
Gọi biểu thức là $A$
\(A=\frac{2^{10}.3^8+5.(2^2)^5.3^8}{2^{10}.(3^3)^3-2^{10}.(3^2)^4}=\frac{2^{10}.3^8+5.2^{10}.3^8}{2^{10}.3^9-2^{10}.3^{8}}\)
\(=\frac{2^{10}.3^8(1+5)}{2^{10}.3^8(3-1)}=\frac{6}{2}=3\)
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\(257-\left(3x+25\right)=157\)
\(3x+25=257-157\)
\(3x+25=100\)
\(3x=75\)
\(x=25\)
vay \(x=25\)
\(x-140:35=270\)
\(x-4=270\)
\(x=274\)
vay \(x=274\)
\(23-\left(x:13\right)=18\)
\(\frac{x}{13}=5\)
\(\frac{x}{13}=\frac{65}{13}\)
\(\Rightarrow x=65\)
vay \(x=65\)
\(9\left(x+5\right)-13=671\)
\(9x+45=684\)
\(9x=639\)
\(x=71\)
vay \(x=71\)
\(9\left(4x\right)-13=24\)
\(36x=37\)
\(x=\frac{37}{36}\)
vay \(x=\frac{37}{36}\)
\(\left(x-5\right)-34:17=1\)
\(\left(x-5\right)-2=1\)
\(x-5=3\)
\(x=8\)
vay \(x=8\)
\(\left(2x-7\right).3=3\)
\(2x-7=1\)
\(2x=8\)
\(x=4\)
vay \(x=4\)
\(\left(3x-5\right):2=4.5\)
\(\left(3x-5\right):2=20\)
\(3x-5=10\)
\(3x=15\)
\(x=5\)
vay \(x=5\)
con lai lam tuong tu
mk moi tay roi nen ban tu lam vay
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\(3^0.3^5.3^7=3^{12}\)
\(16^3:4^2=4^6:4^2=4^4\)
\(2^4.4^3=2^4.2^6=2^{10}\)
\(2^4.5^4\left(2.5\right)^4=10^4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
làm ơn giúp mình ,bạn nào làm nhanh đúng mình chọn cho nhanh nha mọi người
![](https://rs.olm.vn/images/avt/0.png?1311)
vế trái được viết dưới dạng :
\(\frac{3}{5}.\left(\frac{1}{2!}+\frac{1}{3!}+\frac{1}{4!}+....+\frac{1}{100!}\right)< \frac{3}{5}.\left(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+....+\frac{1}{99.100}\right)\)
\(=\frac{3}{5}\left(1-\frac{1}{100}\right)< \frac{3}{5}=0,6\)
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\(5.3^x-35=4.5^2\)
\(5.3^x=4.25+35\)
\(5.3^x=100+35\)
\(3^x=135:5\)
\(3^x=27\)
\(3^x=3^3\)
\(\Rightarrow x=3\)
vậy \(x=3\)
5.3^x-35=4.5^2
=>5.3^x-35=100
=>5.3^x=100+35
=>5.3^x=135
=>3^x=135:5
=>3^x=27
=>3^x=3^3
=>x=3
Vậy x = 3
a) (4x+2x+18.5-10).3=66.5
=>4x+2x+18.5-10=22.5
=>6x+90-10=110
=>6x+80=110
=>6x=110-80
=>6x=30
=>x=30:6
=>x=5
b) 15+5.4+3.10+5.3=4.5.x
=>5(3+4+3.2+3)=4.5.x
=>3+4+3.2+3=4x
=>3+4+6+3=4x
=>16=4x
=>x=16:4
=>x=4
My ơi! Công thức thì chịu khó dùng hàm đi. Làm thế nó chép bài đấy!