câu 8: tính a) 7/15 + 4/5 b) 4/5 x 5/8 c) 2/3 - 3/8 d) 1/2 : 2/5
Bài 1: Tính :
a) 2/5 + 7/10 = ……………………………………………….......................... b) 6/7 - 5/8 = …………………………………………………………………… c) 3/5 x 15/8 =…………………………………………………………............ d) 1/4 : 3/7 =……………………………………………………………..............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 ).
Tính:
A) 7/15+4/5=................... B) 5/8+2=....................
C) 2/3-3/8=................. D) 4-2/5=...................
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a) 2/5 + 7/10 =
b) 6/7 - 5/8 =
c) 3/5 x 15/8 =
d) 1/4 : 3/7 =
Bài 1 : Tính bằng hai cách
a) ( 6/11 + 5/11 ) x 3/7 =
b) 3/5 x 7/9 - 3/5 x 2/9 =
c) ( 6/7 - 4/7 ) : 2/5 =
d) 8/15 : 2/11 + 7/15 : 2/11 =
Bài 2 : Tính
a) 2 x 3 x4/3 x 4 x 5 =
b) 2/3 x 3/4 x 4/5 : 1/5 =
c) 1 x 2 x 3 x 4 / 5 x 6 x 7 x8 =
d) 2/5 x 3/4 x 5/6 : 3/4 =
a, 7/15 + 4/5 =
b, 4/5 x 5/8 =
c, 2/3 - 3/8 =
d, 9/7 : 5 =
bài 2 tính a 2/3 + 3/4 b 5/6 - 1/3 c 4/5 chia 3/4 d 2/5 x 15/8
Tính a)16/13-(3/15-6/13)
b)21/8-(1/2+3/5)
c)3/2x9/5-3-2x2/7
d)32/45x18/16
e)(4/3-4/5)x25/2
f)2-1/3-1/2-1/6-3/12