456
Giới thiệu về bản thân
`123 + 123 = 246`(C1)
`123 + 123 = 123 × 2 = 246`(C2)
\(\left(\dfrac{1}{1.2}+\dfrac{1}{2.3}+\dfrac{1}{3.4}+\dfrac{1}{4.5}\right).x=16\)
\(\left(1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{5}\right).x=16\)
\(\left(1-\dfrac{1}{5}\right).x=16\)
\(\dfrac{4}{5}.x=16\)
\(x=16:\dfrac{4}{5}\)
\(x=16.\dfrac{5}{4}\)
\(x=4.5\)
\(x=20\)
\(x-\dfrac{5}{4}-\dfrac{7}{5}=\dfrac{9}{20}\)
\(x-\dfrac{5}{4}\) \(=\dfrac{9}{20}+\dfrac{7}{5}\)
\(x-\dfrac{5}{4}\) \(=\dfrac{37}{20}\)
\(x\) \(=\dfrac{37}{20}+\dfrac{5}{4}\)
\(x\) \(=\dfrac{37}{20}+\dfrac{25}{20}\)
\(x\) \(=\dfrac{31}{10}\)
Vậy \(x=\dfrac{31}{10}\)
Vì tài khoản của cậu không phải là VIP nhé!
`816 + 1265 + 2184 + 735`
`= (816 + 2184) + (1265 + 735)`
`= 3000 + 2000`
`= 5000`
C.5000
`9/19 - 1,251 + 1,251 + 10/19`
`= (9/19 + 10/19) + (1,251 - 1,251)`
`= 1 + 0`
`= 1`
`(-8) × 24,7 × 0,125`
`= [(-8) × 0,125] × 24,7`
`= (-1) × 24,7`
`= (-24,7)`
`0,25 × 7/15 - 1/4 × (-8/15) + 0,25 `
`= 0,25 × 7/15 - 0,25 × (-8/15) + 0,25 × 1`
`= 0,25 × [7/15 -(-8/15) + 1]`
`= 0,25 × [7/15 + 8/15 + 1]`
`= 0,25 × 2`
`= 0,5`
`59 + 3(x - 8) = 53`
` 3(x - 8) = 53 - 59`
` 3(x - 8) = -6`
` x - 8 = -6 ÷ 3`
` x - 8 = -2`
` x = -2 + 8`
` x = 6`
Vậy `x = 6`
Ps . Chj nhìn lộn,sorry
`59 + 3(x - 8) = 53`
` 3(x - 8) = 53 - 59`
` 3(x - 8) = -6`
` x - 8 = -6 ÷ 3`
` x - 8 = -2`
` x = -2 + 8`
` x = 6`
Vậy `x = 6`
Ps . Chj nhìn lộn,sorry
Chỉnh lại đi đề sai rồi.
Sửa đề.`18/117 × 12/113 + 12/113 × 8/117 + 26/117 × 101/113`
`= (18/117 + 8/117) × 12/113 + 26/117 × 101/113`
`= 26/117 × 12/113 + 26/117 × 101/113`
`= 26/117 × (12/113 + 101/113)`
`= 26/117 × 1`
`= 26/117`