Hãy luôn nhớ cảm ơn và vote 5*
nếu câu trả lời hữu ích nhé!
1324
1251
`B`ài 1 : `Tính`
`a) 10 2/9 + 2 3/5 - 6 2/9`
`= 92/9 + 13/5 - 56/9`
`= 460/45 + 117/45 - 280/45`
`= 297/45`
`= 33/5`
` `
`b) 8 2/7 - (3 4/9 + 4 2/7)`
`= 58/7 - ( 31/9 + 30/7)`
`= 58/7 - 487/63`
`= 522/63 - 487/63`
`= 35/63`
` `
`c) 4 2/3 + 2 3/4` ``x`` `7 8/11`
`= 14/3 + 11/4` ``x`` `85/11`
`= 14/3 + 935/44`
`= 616/132 + 2805/132`
`= 3421/132`
`d) 5 1/8 - 1 3/4 : 2 1/5`
`= 41/8 - 7/4 : 11/5`
`= 41/8 - 35/44`
`= 1804/352 - 280/352`
`= 762/ 17`
`= 381/88`
` `
`e) 3 2/5` ``x`` `6 1/4 + 3 2/5` ``x`` `3 3/4`
`= 17/5` ``x`` `25/4 + 17/5` ``x`` `15/4`
`= 17/5` ``x`` `(25/4 + 15/4)`
`= 17/5` ``x`` `10/1`
`= 34/1`
`f) 3 1/9` ``x`` `12 5/7 - 9 5/7` ``x`` `3 1/9`
`= 28/9` ``x`` `89/7 - 68/7` ``x`` `28/9`
`= 28/9` ``x`` `(89/7 - 68/7)`
`= 28/8` ``x`` `3`
`= 84`
` `
`B`ài 2 : `Tìm x`
`a) x + 2/3 = 2 1/2`
` x + 2/3 = 5/2`
`x = 5/2 - 2/3`
`x = 11/6`
` `
`b) 3 4/5 - x = 18/5`
`19/5 - x = 18/5`
`x = 19/5 - 18/5`
`x = 1/5`
` `
`c) x : 3 1/15 - 3/4 = 2 1/4`
`x : 46/15 = 9/4`
`x = 9/4` ``x`` `46/15`
`x = 207/30`
` `
`d)` `x` ``x`` `3 2/3 - 1 2/3 = 2 1/3`
`x` ``x`` `11/3 - 5/3 = 7/3`
`x` ``x```6/3` `=` `7/3`
`x = 7/3 : 6/3`
`x = 21/18`
\(\#tothithuha96\)
Hãy giúp mọi người biết câu trả lời này thế nào?
Bảng tin