Bài 1:
b: \(2^3\cdot3^2\cdot2005^0=8\cdot9\cdot1=72\)
c: \(4\cdot5^2-3\cdot2^2\)
\(=4\cdot25-3\cdot8\)
=100-24
=76
d: \(\left\lbrack595-\left(25+4\cdot40\right)\right\rbrack:10-1000:25\)
=[595-25-160]:10-40
=[570-160]:10-40
=410:10-40
=41-40
=1
e: \(1440-\left\lbrack\left(216+184\right):4\right\rbrack\cdot9\)
\(=1440-\frac{400}{4}\cdot9\)
=1440-900
=540
g: \(194\cdot12+6\cdot437\cdot2+3\cdot369\cdot4\)
\(=12\cdot194+12\cdot437+12\cdot369\)
\(=12\left(194+437+369\right)=12\cdot1000=12000\)
h: \(275+\left(12-4\right)^2\)
\(=275+8^2\)
=275+64
=339
Bài 2:
a: \(6^5:6^3\cdot3\)
\(=6^2\cdot3=36\cdot3=108\)
b: \(7\cdot4^2-45:3^2+13\)
\(=7\cdot16-45:9+13\)
=112+13-5
=125-5
=120
c: \(13\cdot68+32\cdot13-300\)
\(=13\left(68+32\right)-300\)
=1300-300
=1000
Bài 3:
a: 145-(x-25)=75
=>x-25=145-75=70
=>x=70+25
=>x=95
b: 5(x+1)-125=235
=>5(x+1)=125+235=260
=>x+1=52
=>x=52-1=51
c: 243+(x-2)=453
=>x-2=453-243=210
=>x=210+2
=>x=212
d: (x-3)+15=62
=>x-3=62-15=47
=>x=47+3=50
e: \(3^4:3\left(x-1\right)=3^2\)
=>\(3\left(x-1\right)=\frac{3^4}{3^2}=9\)
=>x-1=3
=>x=3+1
=>x=4
g: \(3^{x}\cdot3-25=218\)
=>\(3^{x+1}=218+25=243=3^5\)
=>x+1=5
=>x=4
