\(a.\dfrac{7}{15}+\dfrac{1}{5}=\dfrac{7}{15}+\dfrac{3}{15}=\dfrac{10}{15}=\dfrac{2}{3}\\ b.3-\dfrac{4}{5}=\dfrac{15}{5}-\dfrac{4}{5}=\dfrac{11}{5}\)
a, 3/4- 2/5+ 5/12
b, 15/7-4/3- 2/9
c, 3/5+ 2/5x 4/5
d, 4/5 -(6/15 +1/5)
Tính bằng cách thuận tiện nhất
A. 3/5 * 6/7 + 3/5 : 7 + 6/5
B. 29/12 : 1/2 - 5/12 : 1/2 - 1/2
C. 2/15 * 4/7 + 4/7 * 2/3 + 4/7 : 5
D. 14/15 * 15/16 * 16/17 : 14/51
a/ 2/3 - 2/5 = ?
b/4/15 + 9/5 = ?
c/ 7/4 - 1/3 : 4/5 = ?
2. Tính: A) 1/3 + 1/5 - 1/4. B) 7/8 - ( 1/4 + 2/5 ). C) 5/11 - ( 3/5 - 6/11 ). D) 5/7 - ( 19/35 - 6/15 ).
2. Tính: A) 1/3 + 1/5 - 1/4. B) 7/8 - ( 1/4 + 2/5 ). C) 5/11 - ( 3/5 - 6/11 ). D) 5/7 - ( 19/35 - 6/15 ).
a) 60 × (7/12 + 4/15) =
b) 5/6 ×( 6/5 - 6/7 ) =
c) 1/2 × 2/3 × 3/4 × 4/5 × 5/6× 6/7 × 7/8 × 8/9 =
a,6/7 - 5/7 + 4/7 - 3/7 + 2/7 - 1/7 ( B3: Tính = cách thuận tiện nhất )
b, 3/4- 3/5 + 1/4 - 2/5
B4 : so sánh 2 phân số [ >,<,= ]
a, 12/36...1/3 b, 5/4...6/7 c, 7/9...8/9
d,11/15...1/13 1/2...5/10
B5: Đặt tính rồi tính
a, 5/15 + 2/5 b, 2/7 + 12/21 c,16/24 + 5/12 d,1/3 + 1/4 + 5/6
d, 19/24 - 3/8 e,8/9 - 1/3 g,3+1/3 k, 5/8 + 7/4 + 7/12
tính bằng cách huận tiện nhất A 3 + 4 + 2 + 1 + 2
b/ 8 + 4 + 19 + 11 5 7 5 7 7 27 15 27 15
a) 2/5 + 7/10 =
b) 6/7 - 5/8 =
c) 3/5 x 15/8 =
d) 1/4 : 3/7 =
Bài 1: Tính :
a) 2/5 + 7/10 = ……………………………………………….......................... b) 6/7 - 5/8 = …………………………………………………………………… c) 3/5 x 15/8 =…………………………………………………………............ d) 1/4 : 3/7 =……………………………………………………………..............
