12.5 . -5/7 + 9 3/4 - 1.5 . 5/7
12,5 : (-7,5) + 1,5 : (-7,5)
= 12,5 . (-5/7) + 1,5 . (-5/7)
= (12,5 + 1,5) . (-5/7)
= 14 . (-5/7)
= -10
12.5 :(-7/5)+1.5:(-7/5)
=(12.5+1.5):(-7/5)
=14:(-7/5)
=-10
=\(30:\frac{-7}{5}+5:\frac{-7}{5}\)
=\(\left(60+5\right):\frac{-7}{5}\)
=\(65\cdot\frac{5}{-7}\)
=\(\frac{-325}{7}\)
nhớ k cho mình nha
Tìm x thuộc z biết (3/4)^2x=12.5^9.(-7)^10+3.7^9.(-5)^11/35^9.2^4
a/ (3/4)2x=12.59.(-7)10+3.79.(-5)11/359.24
(13+2/9 - 15+2/3).(302 - 54)
(18+3/7 - 17+1/4).(25-12.52)
x Y=
2/11+3/13+4/15+5/17
4+1/11+5/13+9/15+13/17
Câu 1:Tìm x biết x thuộc Z:
a,(3/4)^2x = (12.5^9.(-7)+3.7^9.(-5).11) / (35^9.2^4)
b,1/3+1/6+1/10+...+2/x.(x+1)=449/1000
(3/4)^2x=(12.59.(-7)10+3.79.(-5)11)/359.24 .
TÌM X , mong các bạn giải giùm
Giai giup mik voi
5/9.2/7+5/1.5/9+4/9
B,(2/3.5/7+2/3:7/2)-1/3
Cam on trc nha
5/7 . 3/11+ -5/7 . 9/11 + 1.5/7
\(=\dfrac{5}{7}\cdot\dfrac{3}{11}-\dfrac{5}{7}\cdot\dfrac{9}{11}+\dfrac{5}{7}=\dfrac{5}{7}\left(\dfrac{3}{11}-\dfrac{9}{11}+1\right)=\dfrac{5}{7}\cdot\dfrac{5}{11}=\dfrac{25}{77}\)
\(\dfrac{5}{7} . \dfrac{3}{11} + \dfrac{-5}{7} . \dfrac{9}{11} + 1 . \dfrac{5}{7} \)
\(= \dfrac{5}{7} . \dfrac{3}{11} - \dfrac{5}{7} . \dfrac{9}{11} + 1 .\dfrac{5}{7} \)
\(= \dfrac{5}{7} . ( \dfrac{3}{11} - \dfrac{9}{11} - 1 )\)
\(= \dfrac{5}{7} . \dfrac{5}{11} \)
\(= \dfrac{25}{77} \)
Bài 1
A) 3/2+9/2 -6
B) -5/4:(1/4-7/8)+3/2 x(1/3-5/6)
C) (-2,5)x0,65 -1.5 x 0,3+(-0,35)x1,5
a: =6-6=0
b: \(=\dfrac{-5}{4}:\dfrac{2-7}{8}+\dfrac{3}{2}\cdot\dfrac{2-5}{6}\)
\(=\dfrac{-5}{4}\cdot\dfrac{8}{-5}+\dfrac{3}{2}\cdot\dfrac{-3}{6}\)
\(=2+\dfrac{-9}{12}=2-\dfrac{3}{4}=\dfrac{5}{4}\)
c: \(=2,5\cdot\left(-0,65\right)+1,5\left(-0,3-0,35\right)=-0,65\cdot4=-2,6\)