( 1/4 + -5/13 ) + ( 2/11 + -8/13 + 3/4 ) ( 21/31 + -16/7 ) + ( 44/53 + 10/31 ) + 9/53 05/10/2021 Bởi Rose ( 1/4 + -5/13 ) + ( 2/11 + -8/13 + 3/4 ) ( 21/31 + -16/7 ) + ( 44/53 + 10/31 ) + 9/53
Đáp án: Giải thích các bước giải: `a)( 1/4 + (-5)/13 ) + ( 2/11 +( -8)/13 + 3/4 )` `=(1/4 +3/4) -(5/13 +8/13) +2/11` `=1-1 +2/11` `=0 +2/11` `=2/11` `b)( 21/31 + (-16)/7 ) + ( 44/53 + 10/31 ) + 9/53` `=(21/31 +10/31) + (44/53 +9/53 ) -16/7` `=1+1- 16/7` `=2- 16/7` `=(-2)/7` Bình luận
( 1/4 + -5/13 ) + ( 2/11 + -8/13 + 3/4 ) =-7/52 + 181/572 =2/11 ( 21/31 + -16/7 ) + ( 44/53 + 10/31 ) + 9/53 =-349/217+1894/1643+9/53 =-2/7 Bình luận
Đáp án:
Giải thích các bước giải:
`a)( 1/4 + (-5)/13 ) + ( 2/11 +( -8)/13 + 3/4 )`
`=(1/4 +3/4) -(5/13 +8/13) +2/11`
`=1-1 +2/11`
`=0 +2/11`
`=2/11`
`b)( 21/31 + (-16)/7 ) + ( 44/53 + 10/31 ) + 9/53`
`=(21/31 +10/31) + (44/53 +9/53 ) -16/7`
`=1+1- 16/7`
`=2- 16/7`
`=(-2)/7`
( 1/4 + -5/13 ) + ( 2/11 + -8/13 + 3/4 )
=-7/52 + 181/572
=2/11
( 21/31 + -16/7 ) + ( 44/53 + 10/31 ) + 9/53
=-349/217+1894/1643+9/53
=-2/7