\(\dfrac{2\times4}{12\times4}+\dfrac{1\times8}{6\times8}-\dfrac{1\times6}{8\times6}\\ =\dfrac{8}{48}+\dfrac{8}{48}-\dfrac{6}{48}=\dfrac{10}{48}=\dfrac{5}{12}\)
tinh bang cach thuan tien nhat
1/2+1/6+1/12+1/20
1/2+1/6+1/12+1/20+.........+19900
1/2+1/3+1/4+1/8+1/16
1/2+1/3+1/4+1/8+1/16+.......+1/512
Tinh nhanh 1/2+1/6+1/12+1/20 1-1/2-1/4-1/8-1/16.
tinh
a 7/15 + (5/6 - 1/3) =
b 4/7 *21/16 : 5/8 =
c 15/8 - 4/9 * 6/8+ 1/6 =
d 5/12+(3/4 + 2/3 ) : 34/3 =
Dien < > =
A 2/3:5/6. 4/5×2/3
B 1/2×3/4. 5/8:6/8
C 9/7:3/2. 7/6:1/4
D 13/12:12/11. 11/10:10/9
CAC BAN NHO VIET KET QUA DUOI MOI PHAN SO MA MINH TINH DUOC NHE
tính
3/2+5/4+5/8
3/7*4/5/3
2 tinh nhanh
1/2+1/6+1/12+120
Giúp mk với mk chỉ còn đến 9;00 là nộp bài rồi
bai 1; 2/5 + 1/2 + 7/10 ; 4/9 + 11/8 - 5/6 ; 9/20 - 8/15 * 5/12
bai 2 ; 2/5 + 3/10 - 1/2 ; 8/11 + 8/33 * 3/4
bai 3 ; x - 3/4 = 1/2 ;
bai 4 ; tinh chu vi hinh chu nhat co chieu dai 4/5 m va chieu rong 2/3 m
2/5+2/3+3/4
2/6+3/12
5/6+1/3
1/3+5/12+5/6
5/8+4/7
1/5+5/35
5/8+3/4
1/6+1/3+1/12
1/6+5/24+2/3
7/3+8/7
2/5+1/6
1/7+1/4+6/7+3/4
giúp với
và ai giải được gọi cụ
tinh nhanh 1/2 +1/6 +1/12 +1/20 +1/30 +1/42
Tinh :1/2+2/6+3/9+4/12+5/15+6/18
