5^x+3-13=112

5^x+3 -13 =112

1) –45 + 5.(–2x) = 95
2) x.(12 + x).(71 – x) = 0
3) (x – 11).(x + 12).(–x – 13) = 0
4) |2.x – 15| = 7
5) –2.|x + 32| = –112

A =( 2/39 −1/15 −2/153 : 1/34 +3/20 −3/26)  :( 1+2/71 −5/121: 65/121 −26/71 −13 )

B = ( 112/13.20 +112/20.27 +112/27.34 +...+112/62.69 ) :( −5/9.13 −7/9.25 −13/19.25 −31/19.69 )

mấy cái dấu / hay : là thay cho phân số

Tìm số nguyên x, biết

a, 123 - 5 ( x + 4 ) = 38

b, ( 3x - 2⁴ ) . 7³ = 2 . 7⁴

c, 5^x+3 - 13 = 112

1)Tinh

a)\(A=\left(\frac{112}{13.20}+\frac{112}{20.27}\frac{112}{27.34}+...+\frac{112}{62.69}\right):\left(-\frac{5}{9.13}-\frac{7}{9.25}-\frac{13}{19.15}-\frac{31}{19.69}\right)\)

b)\(B=\frac{2.2012}{1+\frac{1}{1+2}+\frac{1}{1+2+3}+\frac{1}{1+2+3+4}+...+\frac{1}{1+2+3+...+2012}}\)

X x 14-13 x 2= 112:76

\(\frac{\frac{3}{7}-\frac{3}{17}+\frac{3}{37}}{\frac{5}{7}-\frac{5}{17}+\frac{5}{37}}+\frac{\frac{1}{2}-\frac{1}{3}+\frac{1}{4}-\frac{1}{5}}{\frac{7}{5}-\frac{7}{4}+\frac{7}{3}-\frac{7}{2}}\) =?

\(\left(\frac{112}{13.20}+\frac{112}{20.27}+\frac{112}{37.34}+....+\frac{112}{62.69}\right):\left(\frac{5}{9.13}-\frac{7}{19.25}-\frac{13}{19.25}-\frac{31}{19.69}\right)\)=?