Thực hiện phép tính
a ) -2 / 5 + 7 / 21
b ) 3 / 8 + -5 / 6
c ) -16 / 24 – 5/8 =
d ) -7/2 + 3/4 – 17/12
e ) -5 / 6 – ( – 3/8 + 1 / 10 )
f ) 2/5 + -4/ 3 + ( -1/2 )
g ) 3/12 – ( 6/15 – 3/10 )
giúp e với ạ gấp lắm thanks trc ạ
Thực hiện phép tính
a ) -2 / 5 + 7 / 21
b ) 3 / 8 + -5 / 6
c ) -16 / 24 – 5/8 =
d ) -7/2 + 3/4 – 17/12
e ) -5 / 6 – ( – 3/8 + 1 / 10 )
f ) 2/5 + -4/ 3 + ( -1/2 )
g ) 3/12 – ( 6/15 – 3/10 )
giúp e với ạ gấp lắm thanks trc ạ
a ) -2 / 5 + 7 / 21
=-42/105+35/105
=-17/105
b ) 3 / 8 + -5 / 6
=12/24+(-15/24)
=-3/24
=-1/24
c ) -16 / 24 – 5/8
= -16 / 24 – 15/24
=-31/24
d ) -7/2 + 3/4 – 17/12
=-42/12+9/12-17/12
=16/12
=4/3
e ) -5 / 6 – ( – 3/8 + 1 / 10 )
= -5 / 6 + 3/8 – 1 / 10
=-100/120+45/120-12/120
=-67/120
f ) 2/5 + -4/ 3 + ( -1/2 )
=12/30+-40/30+( -15/30)
=43/30
g ) 3/12 – ( 6/15 – 3/10 )
= 3/12 – 6/15 + 3/10
=15/60-24/60+18/60
=9/60
=3/20
#Creative Team Name
a, -2/5 + 7/21
= -14/105 + 35/105
= 21/105
= 1/5
b, 3/8 + -5/6
= 9/24 + -20/24
= -11/24
c, -16/24 – 5/8
= -16/24 – 15/24
= -31/24
d, -7/2 + 3/4 – 17/12
= -42/12 + 9/12 – 17/12
= -40/12
= -10/3
e, -5 / 6 – ( – 3/8 + 1 / 10 )
= -5/6 + 3/8 – 1/10
= -100/120 + 45/120 – 12/120
= -67/120
f ) 2/5 + -4/ 3 + ( -1/2 )
= 12/30 + -40/30 + -15/30
= -43/30
g ) 3/12 – ( 6/15 – 3/10 )
= 3/12 – 6/15 + 3/10
= 15/60 – 24/60 + 18/60
= 9/60
= 3/20
XIN HAY NHẤT NHÉ !!!