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TL
12 : 1,25 : 8
= 12 : (1,25 x 8 )
= 12 : 10
=1,2
HT
Học tốt nha bạn^^
12 : 1,25 : 8
= 12 : (1,25 x 8 )
= 12 : 10
=1,2
tích cho tui nhé
A = \(\dfrac{4}{1\times3}\) - \(\dfrac{8}{3\times5}\) + \(\dfrac{12}{5\times7}\) - \(\dfrac{16}{7\times9}\) + \(\dfrac{20}{9\times11}\) - \(\dfrac{24}{11\times13}\)
A = ( \(\dfrac{1}{1}+\dfrac{1}{3}\)) - ( \(\dfrac{1}{3}\) + \(\dfrac{1}{5}\)) + (\(\dfrac{1}{5}\)+ \(\dfrac{1}{7}\)) - ( \(\dfrac{1}{7}\) + \(\dfrac{1}{9}\)) +( \(\dfrac{1}{9}\)+ \(\dfrac{1}{11}\)) - (\(\dfrac{1}{11}\)+\(\dfrac{1}{13}\))
A = \(\dfrac{1}{1}+\dfrac{1}{3}\) - \(\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}+\dfrac{1}{7}\) - \(\dfrac{1}{7}\) - \(\dfrac{1}{9}\) + \(\dfrac{1}{9}\) + \(\dfrac{1}{11}\) - \(\dfrac{1}{11}\) - \(\dfrac{1}{13}\)
A = \(\dfrac{1}{1}\) - \(\dfrac{1}{13}\)
A = \(\dfrac{12}{13}\)
\(Y:\dfrac{7}{5}=\dfrac{5}{6}+\dfrac{5}{12}=\dfrac{15}{12}\\ Y=\dfrac{15}{12}\times\dfrac{7}{5}=\dfrac{7}{4}\)
\(y:\dfrac{7}{5}=\dfrac{5}{6}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{5\times2}{6\times2}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{10}{12}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{15}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{5}{4}\\ \Leftrightarrow y=\dfrac{5}{4}\times\dfrac{7}{5}\\ \Leftrightarrow y=\dfrac{7}{4}\)
\(\Rightarrow C\)
Tìm x:
- x . 7 + x . 12 =266
- x . 3,5 - x . 1,7 = 81,486
- x . 7 + x . 12 =266
- x . 3,5 - x . 1,7 = 81,486
- 49,8 - x : 2,4 = 29,8
- (x-12 ) . 2 + 3 = 7
- ai giúp mk thì mk k ^.^
Tìm x:
- x . 7 + x . 12 =266
- x . 3,5 - x . 1,7 = 81,486
- 49,8 - x : 2,4 = 29,8
- (x-12 ) . 2 + 3 = 7
- ai giúp mk thì mk k ^.^
- 49,8 - x : 2,4 = 29,8
Tìm x:
- x . 7 + x . 12 =266
- x . 3,5 - x . 1,7 = 81,486
- 49,8 - x : 2,4 = 29,8
- (x-12 ) . 2 + 3 = 7
- ai giúp mk thì mk k ^.^
- (x-12 ) . 2 + 3 = 7
- ai giúp mk thì mk k ^.^
1. x.7 + x.12 = 266
x.(7+12) = 266
x.19 =266
x = 266:19
x = 14
2. x.3,5-x.1,7 = 81,486
x.(3,5-1,7) = 81,486
x.1,8 = 81,486
x = 81,486 : 1,8
x = 45,27
3. (x- \(\frac{1}{2}\) ) .2 + 3 = 7
\(\left(x-\frac{1}{2}\right).2=7-3=4\)
\(x-\frac{1}{2}=4:2=2\)
\(x=2-\frac{1}{2}\)
\(x=\frac{3}{2}\)
=(49,8-48,5)+(47,2-45,9)+(44,6-43,3)+(42-40,7)
= 1,3 + 1,3 + 1,3 +1,3
=1,3x4
=5,2
49,8 : 12 giúp mình với ạ
49,8 : 12 = 4,15
@Trunglaai?
bằng 4,15