1/2 + 3/2 + 9/3
= 2 + 9/3
= 6/3 + 9/3
= 5
\(\frac{1}{2}+\frac{3}{2}+\frac{9}{3}=\frac{4}{2}+\frac{9}{3}=2+3=5\)
Chọn phép tính đúng:
A 1/2×1/2=1×1 2×2=1/4
B 3/5×4/9=3×9 5×4=2720
C 5/3×3/7=3×3 5×7=935
D 7/9×3/8=7×3/ 9×8=724
2/3+5/2-3/4=
2/5*1/2/1/3=
2/9/2/9/1/2=
4/5-1/2+1/3=
1/2*1/3+1/4=
2/7/2/3-1/7=
2/3+5/2-3/4=
4/5-1/2+1/3=
2/5×1/2:1/3=
1/2×1/3+1/4=
2/9:2/9×1/2=
2/7:2/3-1/7=
2/9-1/3+1/9-2/5+6/9-4/15+2/3 ?
Bài 1:
a) 8/7 - 5/11 : 8 b) 1 + 2/9 : 7/3 - 10/7 c) 11/3 - 2 : 7/3 + 4
Bài 2:
a) 9/4 - x = 5/11 : 1/2 b) 2/9 : x = 7/3 - 10/7
Bài 3:
\(\dfrac{1999x1998-1}{1997x1999+1998}\)
a/9 = 1/3
1/9 + x = 2/18 + 3/4
x ÷ 1/2 = 3/4
1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9=?
tìm x 2*x+1/9=5/3 b 2/9*x+1/5*x=2/3-3/5
Tính giá trị biểu thức :
a, 3/4 + 1/2 x 7/2 b, 6/15 - 1/3 : 5/3
c, x - 4/9 = 3/7 : 9/4 d, 7/9 x 3/5 - 1/2 = 1/5
