Question

a) 4/16 + 5/10  - (-3)/70

Answer 1

\(\dfrac{4}{16}+\dfrac{5}{10}-\left(-\dfrac{3}{70}\right)\)

\(=\dfrac{4}{16}+\dfrac{5}{10}+\dfrac{3}{70}\)

\(=\dfrac{3}{4}+\dfrac{3}{70}\)

\(=\dfrac{111}{140}\)

Answer 2

\(a,\dfrac{4}{16}+\dfrac{5}{10}-\dfrac{-3}{70}\)

\(=\dfrac{1}{4}+\dfrac{1}{2}+\dfrac{3}{70}\)

\(=\dfrac{3}{4}+\dfrac{3}{70}\)

\(=\dfrac{210}{280}+\dfrac{12}{280}\)

\(=\dfrac{222}{280}\)

\(=\dfrac{111}{140}\)

Answer 3

`4/16 + 5/10 - (-3/70)`

`=4/16 + 5/10 + 3/70`

`= 1/4 + 1/2 + 3/70`

`= 1/4 + 2/4 + 3/70`

`= 3/4 + 3/70`

`=111/140`

Answer 4

\(\dfrac{4}{16}+\dfrac{5}{10}-\dfrac{-3}{70}=\dfrac{1}{4}+\dfrac{1}{2}-\dfrac{-3}{70}=\dfrac{2}{8}+\dfrac{4}{8}-\dfrac{-3}{70}\)

\(=\dfrac{6}{8}-\dfrac{-3}{70}=\dfrac{210}{280}-\dfrac{-12}{280}=\dfrac{222}{280}=\dfrac{111}{140}\)

Answer 5

16 = 2⁴

10 = 2.5

70 = 2⁴.5.7

BCNN (16,10,70) = 2⁴.5.7 = 560

tìm thừa số phụ

560 : 16 = 35

560 : 10 = 56

560 : 70 = 8

4/16 = 4/16 x 35/35 = 140/560

5/10 = 5/10 x 56/56 = 280/560

(-3)/70 = (-3)/70 x 8/8 = (-24)/560

140/560 + 280/560 - (-24)/560 = 444/560 = 111/140