giúp mik bài này vs:
a, 45/4 – ( 19/7 + 21/4 )
b, 4/9 : ( -1/7) + 59/9 : ( -1/7)
c, ( 14/3 – 7/6 ) : ( 1,75 + 10/9 )
d, 0,5 . 4/3 . 10 . 75% . 7/35
e, -10,42 : ( 21,34 – 1/2 ) + 2/3 . ( -0,75 )
giúp mik bài này vs:
a, 45/4 – ( 19/7 + 21/4 )
b, 4/9 : ( -1/7) + 59/9 : ( -1/7)
c, ( 14/3 – 7/6 ) : ( 1,75 + 10/9 )
d, 0,5 . 4/3 . 10 . 75% . 7/35
e, -10,42 : ( 21,34 – 1/2 ) + 2/3 . ( -0,75 )
a,
`45/4-(19/7+21/4)=45/4-223/28=23/7`
b,
`4/9:(-1/7)+59/9:(-1/7)=4/9*(-7)+59/9*(-7)=-7*(4/9+59/9)=-7*7=-49`
c,
`(14/3-7/6):(1,75+10/9)=7/2:103/36=126/103`
d,
`0,5*4/3*10*75%*7/35=1/2*4/3*10/1*3/4*7/35=1`
e,
`-10,42:( 21,34-1/2)+2/3.( -0,75)`
`=-10,42:20,84-1/2`
`=1/2-1/2`
`=0`
Đáp án:
`↓↓`
Giải thích các bước giải:
`a, 45/4 – ( 19/7 + 21/4 )`
`=45/4-223/28`
`=23/7`
`b, 4/9 : ( -1/7) + 59/9 : ( -1/7)`
`=(4/9+59/9):(-1/7)`
`=7:(-1/7)`
`=-49`
c`, ( 14/3 – 7/6 ) : ( 1,75 + 10/9 )`
`=7/2:103/36`
`=126/103`
`d, 0,5 . 4/3 . 10 . 75% . 7/35`
`=(4/3.7/35).(0,5.10).75%`
`=4/15.15/4`
`=1`
`e, -10,42 : ( 21,34 – 1/2 ) + 2/3 . ( -0,75 )`
`=-10,42:20,84-1/2`
`=1/2-1/2`
`=0`
Hocj too