Toán a.-2/3×15/19+ -2/3×4/19+32/3 b. -5/9+5/9÷(1 và2/3- 2 và1/12) 07/09/2021 By Savannah a.-2/3×15/19+ -2/3×4/19+32/3 b. -5/9+5/9÷(1 và2/3- 2 và1/12)
*Lời giải : `a) (-2)/3 . 15/19 + (-2)/3 . 4/19 + 32/3` `= (-2)/3 . (15/19 + 4/19) + 32/3` `= (-2)/3 . 1 + 32/3` `= (-2)/3 + 32/3` `= 30/3` `= 10` `b) (-5)/9 + 5/9 : (1 2/3 – 2 1/12)` `= (-5)/9 + 5/9 : (5/3 – 25/12)` `= (-5)/9 + 5/9 : (-5)/12` `= (-5)/9 + (-4)/3` `= (-17)/9` Trả lời
a) `-2/3 . 15/19 + (-2/3) . 4/19 + 32/3` `= -2/3( 15/19 + 4/19) + 32/3` `= -2/3 . 19/19 + 32/3` `= -2/3 . 1 + 32/3` `= -2/3 + 32/3` `= 10` b) `-5/9 + 5/9 : ( 1 2/3 – 2 1/12)` `= -5/9 + 5/9 : ( 5/3 – 25/12)` `= -5/9 + 5/9 : (-5/12)` `= -5/9 + 5/9 . (-12/5)` `= 5/9 ( -1 – 12/5)` `= 5/9. (-17/5)` `= -17/9` Trả lời
*Lời giải :
`a) (-2)/3 . 15/19 + (-2)/3 . 4/19 + 32/3`
`= (-2)/3 . (15/19 + 4/19) + 32/3`
`= (-2)/3 . 1 + 32/3`
`= (-2)/3 + 32/3`
`= 30/3`
`= 10`
`b) (-5)/9 + 5/9 : (1 2/3 – 2 1/12)`
`= (-5)/9 + 5/9 : (5/3 – 25/12)`
`= (-5)/9 + 5/9 : (-5)/12`
`= (-5)/9 + (-4)/3`
`= (-17)/9`
a) `-2/3 . 15/19 + (-2/3) . 4/19 + 32/3`
`= -2/3( 15/19 + 4/19) + 32/3`
`= -2/3 . 19/19 + 32/3`
`= -2/3 . 1 + 32/3`
`= -2/3 + 32/3`
`= 10`
b) `-5/9 + 5/9 : ( 1 2/3 – 2 1/12)`
`= -5/9 + 5/9 : ( 5/3 – 25/12)`
`= -5/9 + 5/9 : (-5/12)`
`= -5/9 + 5/9 . (-12/5)`
`= 5/9 ( -1 – 12/5)`
`= 5/9. (-17/5)`
`= -17/9`