Toán 5/7 . 5/11 + 5/7 . 6/11 – 2/7 1/2x – 33/55 =20/50 5/6 + 1/5 – 2/3 20/09/2021 By Melody 5/7 . 5/11 + 5/7 . 6/11 – 2/7 1/2x – 33/55 =20/50 5/6 + 1/5 – 2/3
5/7.5/11+5/7.6/11-2/7 1/2x-22/55=20/50 =5/7.(5/11+6/11)-2/7 1/2x = 2/5+3/5 =5/7. 1 -2/7 1/2x = 1 = 5/7 -2/7 x = 1:1/2 = 3/7 x = 2 5/6+1/5-2/3 = 31/30-2/3 = 11/30 Trả lời
a, 5/7 . 5/11 + 5/7 . 6/11 – 2/7 = 5/7 . (5/11 + 6/11) – 2/7 = 5/7 . 1 – 2/7 = 3/7 b, 1/2x – 33/55 = 20/50 1/2x – 3/5 = 2/5 1/2x = 2/5 + 3/5 1/2x = 1 x = 1 : 1/2 x = 2 c, 5/6 + 1/5 – 2/3 = 25/30 + 6/30 – 20/30 = 11/30 Chúc bạn học tốt Cho mình ctlhn a Trả lời
5/7.5/11+5/7.6/11-2/7 1/2x-22/55=20/50
=5/7.(5/11+6/11)-2/7 1/2x = 2/5+3/5
=5/7. 1 -2/7 1/2x = 1
= 5/7 -2/7 x = 1:1/2
= 3/7 x = 2
5/6+1/5-2/3
= 31/30-2/3
= 11/30
a, 5/7 . 5/11 + 5/7 . 6/11 – 2/7
= 5/7 . (5/11 + 6/11) – 2/7
= 5/7 . 1 – 2/7
= 3/7
b, 1/2x – 33/55 = 20/50
1/2x – 3/5 = 2/5
1/2x = 2/5 + 3/5
1/2x = 1
x = 1 : 1/2
x = 2
c, 5/6 + 1/5 – 2/3
= 25/30 + 6/30 – 20/30
= 11/30
Chúc bạn học tốt
Cho mình ctlhn a