Bài 1. Tính.
a) 2 + 3/4 b) 1/3 + 3/2 −7/4
c) 1/6 + 3/8 −1/4 d) 5/12 + 3/8 × 4/9
e) 4/5 −1/5 × 7/2 f) 16/9 −4/15 : 2/5
Bài 2. Tính:
a) 7/9 × 3/14 : 5/8 b) 3/5 × 4/21 × 25/3
c) 15/16 : 5/8 × 3/4 d) 2/14 × 16/14 × 1/2 × 8/3
Bài 3 Tính bằng cách thuận tiện:
a) 21/25×2/5+21/25×3/5 b) 5/2×3/4−3/14:6/7
c) 3/10×7/4−3/10×3/4 d) 7/12+6/9+3/8+5/12+1/3+5/8
Bài 4 Tìm x
a)x × 37 = 1−5/8 b) 8/3 − x= 9/10 × 5/3
c) x : 5/9 = 2−11/8 d) x × 2/3 + x × 7/3=114
Bài 1:
A. \(\dfrac{11}{4}\) B. \(\dfrac{1}{3}\) C. \(\dfrac{13}{24}\) D. \(\dfrac{4}{9}\) E. \(\dfrac{1}{10}\) F. \(^{\dfrac{10}{9}}\)
Bài 2:
A. \(\dfrac{4}{15}\) B. \(\dfrac{20}{9}\) C. \(\dfrac{9}{8}\)
bài 3:
A. \(\dfrac{21}{25}\) B. \(\dfrac{3}{2}\) C. \(\dfrac{3}{10}\) D. 3
Bài 4:
A: x= \(\dfrac{3}{296}\) B. \(\dfrac{7}{6}\) C. 9 D. 38