bài 1:tìm x,y: a)19/20-y=8/3-3/4 b)y:2/3=4/9x3 c)7/9:X=28/15 d3/98 x X=9/10 e)X:12/13=2/5 f)7/8-X=1/2 làm ơn hicc
2 câu trả lời
bài 1
a)19/20-y=8/3-3/4
=19/20-y=23/12
y=19/20-23/12
y=-29/30
b) y : 2/3=4/9 x 3
y : 2/3 = 4/3
y =4/3 x 2/3
y =8/9
c)7/9 : x =28/15
x=28/15 . 7/9
x=196/135
d)3/98 . x =9/10
x=9/10 : 3/98
x= 9/10 . 98/3
x=147/5
e)x : 12/13=2/5
x= 2/5 . 12/13
x= 24/65
f)7/8 - x = 1/2
x= 7/8-1/2
x= 7/8 + -1/2
x= 7/8 + -4/8
x= 3/8
LƯU Ý : DẤU CHẤM VIẾT TẮT LÀ DẤU NHÂN NHÉ !
a)19/20-y=8/3-3/4
19/20-y= 23/12
y=-29/30
b)y:2/3=4/9x3
y:2/3=4/3
y=8/9
c)7/9:X=28/15
x=5/12
d,3/98 x X=9/10
x=147/5
e)X:12/13=2/5
x=24/65
f)7/8-X=1/2
x=3/8
