yx1/3+yx2/5=11/15
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Y x 1 + Y x 2 + Y x 3 + ... + Y x 100 = 12625
Y x (1+2+3+...+100) = 12625
Y x (100+1) x (100:2) = 12625
Y x (101 x 50) = 12625
Y x 5050 = 12625
Y= 12625 : 5050
Y= 2,5
\(y\times1+y\times2+y\times27-\left(99-22\right)=277\)
\(y\times\left(1+2+27\right)-77=277\)
\(y\times30-77=277\)
\(y\times30=277+77\)
\(y\times30=354\)
\(y=\dfrac{354}{30}\)
\(y=\dfrac{59}{5}\)
y x 3 + y x 2 = 58 - ( 15 + 4 + 9 )
y x 5 = 28
y = 28 : 5
y = 5,6
HT
y * 1 + y * 2 + y * 3 + y * 4 + y *1 = 825
y * ( 1 + 2 + 3 + 4 + 1) =825
y * 11 = 825
y = 825 / 11
y = 75
y × 2/3 - 2/3 = 9/12
y × 2/3 = 9/12 + 2/3
y × 2/3 = 9/12 + 8/12
y × 2/3 = 17/12
y = 17/12 : 2/3
y = 17/8
\(\dfrac{2}{3}\left(y-1\right)=\dfrac{9}{12}\)
\(y-1=\dfrac{3}{4}:\dfrac{2}{3}\)
\(y-1=\dfrac{9}{8}\)
\(y=\dfrac{9}{8}+1\)
\(y=\dfrac{17}{8}\)
a) 8/15 + 1 = 23/15
b) 3/14 + 11/14 - 2/3 = 1- 2/3 = 1/3
c) 7/15 * (5/3+2/3) = 7/15 * 7/3= 49/45
d) 6/11 + 5/11 - 3/5 = 1 - 3/5 = 2/5
a) \(\frac{2}{3}-4.\left(\frac{1}{2}+\frac{3}{4}\right)\)
= \(\frac{2}{3}-4.\frac{5}{4}\)
= \(\frac{2}{3}-5\)
= \(-\frac{13}{3}\).
b) Câu này là 117 hay \(\frac{11}{7}\) vậy bạn?
Chúc bạn học tốt!
\(y=\dfrac{11}{25}:\left(\dfrac{1}{3}+\dfrac{2}{5}\right)=\dfrac{11}{25}:\dfrac{11}{15}=\dfrac{15}{25}=\dfrac{3}{5}\)
`y xx 1/3 + y xx 2/5 = 11/15`
`y xx (1/3 + 2/5) = 11/15`
`y xx 11/15 = 11/15`
`y = 11/15 : 11/15`
`y = 1`