Bài 4:
a: \(125+x=567\)
=>x=567-125=442
b: \(125-x=35\)
=>x=125-35=90
c: \(x-127=542\)
=>x=542+127=669
d: x:12=27
=>\(x=27\cdot12=324\)
e: 2x-15=65
=>2x=15+65=80
=>x=80:2=40
f: \(238:17x=2\)
=>\(17x=\dfrac{238}{2}=119\)
=>x=7
g: 125-5x=25
=>5x=125-25=100
=>\(x=\dfrac{100}{5}=20\)
h: 2+x:5=6
=>x:5=6-2=4
=>\(x=4\cdot5=20\)
l: \(5x-5^2=10\)
=>5x-25=10
=>5x=25+10=35
=>\(x=\dfrac{35}{5}=7\)
Bài 5:
a: \(4^3\cdot5+\left\{30\cdot\left[\dfrac{\left(12+2^3\right)}{5}+5^2\right]\right\}\)
\(=64\cdot5+\left\{30\cdot\left(\dfrac{12+8}{5}+25\right)\right\}\)
\(=320+30\cdot\left(\dfrac{20}{5}+25\right)\)
\(=320+30\cdot29=320+870=1190\)
b: \(38+10^2:\left[345-\left(3^2\cdot5+2^3\cdot5^2\right)\right]\)
\(=38+100:\left[345-\left(9\cdot5+8\cdot25\right)\right]\)
\(=38+100:\left\{345-45-200\right\}\)
=38+100:100
=38+1=39
c: \(40-40:\left\{520:\left[500-\left(130+30\cdot8\right)\right]\right\}\)
\(=40-40:\left\{520:\left[500-130-240\right]\right\}\)
\(=40-40:\left\{520:130\right\}=40-40:4=40-10=30\)
e: \(\dfrac{\left[540-\left(25\cdot8+70\right)\right]}{9}-15+19^0\)
\(=\dfrac{540-200-70}{9}-15+1\)
\(=\dfrac{270}{9}-14=30-14=16\)
f: \(\left[1104-\left(25\cdot8+40\right)\right]:9+3^{16}:3^{12}\)
\(=\dfrac{\left[1104-\left(200+40\right)\right]}{9}+3^4\)
\(=\dfrac{1104-240}{9}+81=96+81=177\)
g: \(2^5\cdot3+4\cdot\left[\left(26-22\right)^2:4+6\right]-76^0\)
\(=32\cdot3+4\cdot\left[4^2:4+6\right]-1\)
\(=95+4\cdot\left(4+6\right)=95+40=135\)