1) tim X
a) 2 2 * (X + 3 2) - 5= 55 d) 10 + 2* X =4 5 : 4 3
b) 6* (X+2 3 ) +40 = 100
c) 155- 10 * (X+ 1) = 55
2) tìm X
a) 5* 2 2 + ( X + 3 ) = 5 2 e) 1230 : 3 * ( X - 20 ) = 10
b) 5 * X - 5 2 = 10 f) ( 15 + X ) : 3 = 3 15 : 3 12
c) 10 * X + 2 2 * 5 = 10 2 g) 2* X - 2 0 = 3 5 : 3 3
d) 15 : ( X + 2 ) = 3
chỗ mình cách là cơ số và số mủ ( vd ) 3 2 là 3 mủ 2
mình cần gấp giúp mình nha !!!!!!!!!!!
a, \(2^2.\left(x+3^2\right)-5=55\)
\(4.\left(x+9\right)=55+5\)
\(4.\left(x+9\right)=60\)
\(x+9=60:4\)
\(x+9=15\)
\(x=15-9=6\)
b, \(6.\left(x+2^3\right)+40=100\)
\(6.\left(x+8\right)=100-40\)
\(6.\left(x+8\right)=60\)
\(x+8=60:6\)
\(x+8=10\)
\(x=10-8=2\)
c, \(155-10.\left(x+1\right)=55\)
\(10.\left(x+1\right)=155-55\)
\(10.\left(x+1\right)=100\)
\(x+1=100:10\)
\(x+1=10\)
\(x=10-1=9\)
\(10+2.x=4^5:4^3\)
\(10+2.x=4^2\)
\(10+2.x=16\)
\(2.x=16-10\)
\(2.x=6\)
\(x=6:2=3\)
bài 2:
a, \(5.2^2+\left(x+3\right)=5^2\)
\(5.4+\left(x+3\right)=25\)
\(20+\left(x+3\right)=25\)
\(x+3=25-20\)
\(x+3=5\)
\(x=5-3=2\)
b, \(5.x-5^2=10\)
\(5.x-25=10\)
\(5.x=10+25\)
\(5.x=35\)
\(x=35:5=7\)
c, \(10.x+2^2.5=10^2\)
\(10.x+4.5=100\)
\(10.x+20=100\)
\(10.x=100-20\)
\(10.x=80\)
\(x=80:10=8\)
d, \(15:\left(x+2\right)=3\)
\(x+2=15:3\)
\(x+2=5\)
\(x=5-2=3\)
e, \(1230:3.\left(x-20\right)=10\)
\(410.\left(x-20\right)=10\)
\(x-20=10:410\)
\(x-20=\frac{1}{41}\)
\(x=\frac{1}{41}+20=\frac{821}{41}\)
f, \(\left(15+x\right):3=3^{15}:3^{12}\)
\(\left(15+x\right):3=3^3\)
\(\left(15+x\right):3=27\)
\(15+x=27.3\)
\(15+x=81\)
\(x=81-15=66\)
g, \(2.x-2^0=3^5:3^3\)
\(2.x-1=3^2\)
\(2.x-1=9\)
\(2.x=9+1\)
\(2.x=10\)
\(x=10:2=5\)
kk cho mình nha