x+10.3=60
2Tìm X:
a.(19x+2.5^2):14=(13-8)^2-4^2
b.2.3^x=10.3^12+8.27^4
c.{x^2-[6^2-(8^2-9.7)^3-7.5]^3-5.3}^3=1
d.60-3(x-2)=51
e.4x-20=2^5:2^2
{ x2 - [ 62 - ( 82 - 9.7)3 - 7.5]3 - 5.3 }3 = 1
{ x2 + [ 36 - (64 - 63)3 - 35]3 - 15}3 = 1
[ x2 - ( 36 - 13 - 35 ) - 15 ]3 = 1
[ x2 - ( 36 - 1 - 35 ) - 15]3 = 1
[ x2 - ( 35 - 35 ) - 15]3 = 1
[ x2 - 0 - 15]3 = 1
( x2 - 15 )3 = 1
<=> ( x2 - 15)3 = 13
=> x2 - 15 = 1
<=> x2 = 16
=> x = 4
tìm x 2.3^x=10.3^12+8.27^4
\(2.3^x=10\cdot3^{12}+8.27^4\)
\(10.3^{12}+8.27^4=10.3^{12}+8.3^{12}\)
\(10.3^{12}+8.3^{12}=3^{12}\cdot\left(10+8\right)=3^{12}\cdot18=3^{12}\cdot2\cdot3^2=3^{14}\cdot2\)
=>x = 14
tìm x biết 3^x+9.3^x+2-10.3^x+1
tính nhanh : 9.6 x 12.3 + 4.8 x 85.7 - 10.3 x 4.8
9.6 x 12,3 + 4,8 x 85,7 ‐ 10,3 x 4,8
= 9,6 x 12,3 + 4,8 x 2 x 42,85 ‐ 5,15 x 2 x 4,8
= 9,6 x 12,3 + 9,6 x 42,85 ‐ 5,15 x 9,6
= 9,6 x ﴾ 12,3 + 42,85 ‐ 5,15 ﴿
= 9,6 x 50
= 480
9,6x12,3+4,8x85,7-10,3x4,8
=9,6x12,3+4,8x2x42,85-5,15x9,6
=9,6x12,3+9,6x42,85-5,15x9,6
=9,6x(12,3+42,85-5,15)
=9,6x50
=480(bn k cho mk nhé)
2.3^x = 10.3^2+8.27^4
2.3^x =10.3^12 +8.27^4
4.15/4.7<x<2.5*10.3. tìm x
tìm x
2.3^x = 10.3^12+8.27^4
<=>2.3x=9565938 tính ra số hơi to ^^
=>3x2=2.4782696 ( 2 vế rút gọn 2 )
=>3x=4782969
=>x=14
2. 3^x = 10.3^12 + 8.27^4
\(2.3^x=10.3^{12}+8.27^4\)
\(2.3^x=10.3^{12}+8.3^{12}\)
\(2.3^x=3^{12}\left(10+8\right)\)
\(2.3^x=18.3^{12}\)
\(3^x=9.3^{12}\)
\(3^x=3^{14}\)
\(x=14\)
2.3^x=10.3^12+8^27^4
2.3^x=10.3^4.3+8.27^4
2.3^x=10.27^4+8.27^4
2.3^x=(10+8).27^4
2.3^x=18.27^4
2.3^x=2.9.3^12
2.3^x=2.3^2.3^12
2.3^x=2.3^14
x=14