\(\left(7\frac{4}{9}+4\frac{7}{11}\right)-3\frac{4}{9}\)
\(=7\frac{4}{9}+4\frac{7}{11}-3\frac{4}{9}\)
\(=7\frac{4}{9}-3\frac{4}{9}+4\frac{7}{11}\)
\(=4+4\frac{7}{11}=8\frac{7}{11}\)
\(\left(7\frac{4}{9}+4\frac{7}{11}\right)-3\frac{4}{9}\)
\(=7\frac{4}{9}+4\frac{7}{11}-3\frac{4}{9}\)
\(=7\frac{4}{9}-3\frac{4}{9}+4\frac{7}{11}\)
\(=4+4\frac{7}{11}=8\frac{7}{11}\)
Tính nhanh
A=4/3*5+4/5*7+4/7*9+4/9*11
tính nhanh: (4/5-4/11+4/13)/(9/5-9/11+9/13)+(5/7+5/11-5/13)/(9/7+9/11-9/13)
tính nhanh
-7/9 . 4/11 + -7/9 . 7/11 + 5 7/9
tính nhanh các hỗn số , phân số .... sau:
A = 11 3/13 -(2 và 4/7 +5 3/13)
B = 6 4/9 + 3 7/11)-4 4/9
C = -5/7 x 2/11 + -5/7 x 9/11 +1 5/7
D = 0,7 x 2 2/3 .20 x0,375 x5/28
7 Tính nhanh tổng sau
A=(2+3+4+5+6+7+8+9+10+11+12+13)-(1+2+3+4+5+6+7+8+9+10+11+12)
tính nhanh
2/5+2/7-2/9-2/11
----------------------
4/5+4/7-4/9-4/11
Thực hiện phép tính ( tính nhanh nếu có thể )
1, [6+(1/2)3-|-0,5|]:3/12
2, 1/3+5/4:(-35/16)
3, 11 3/13-(2 4/7+5 3/13)
4, 1 3/7+(-1/3+2 4/7)
5, (6 4/9+3 7/11)-4 4/9
Bài 3: Tính nhanh:
a) \(15\dfrac{3}{13}\)-\(\left(3\dfrac{4}{7}+8\dfrac{3}{13}\right)\)
b) \(\left(7\dfrac{4}{9}+4\dfrac{7}{11}\right)\)-\(3\dfrac{4}{9}\)
c) \(\dfrac{-7}{9}\).\(\dfrac{4}{11}\)+\(\dfrac{-7}{9}\).\(\dfrac{7}{11}\)+\(5\dfrac{7}{9}\)
d) 50%.\(1\dfrac{1}{3}\).10.\(\dfrac{7}{35}\).0,75
e) \(\dfrac{3}{1.4}\)+\(\dfrac{3}{4.7}\)+\(\dfrac{3}{7.10}\)+...+\(\dfrac{3}{40.43}\)
1/ Tính nhanh:
a. 5/7×5/11+5/11×2/9-5/7×17/11
b. 1×2+2×4+3×6+4×8+5×10/3×4+6×8+9×12+12×16+15×20