Question

A,12/8 - 1/4 = B, 9/7 : 9/4 + 3/4 = C, 120 x 34 - 100 x 34 +34 x 80

Answer 1

a) \(\dfrac{12}{8}-\dfrac{1}{4}=\dfrac{6}{4}-\dfrac{1}{4}=\dfrac{5}{4}\)

b) \(\dfrac{9}{7}:\dfrac{9}{4}+\dfrac{3}{4}=\dfrac{9}{7}\times\dfrac{4}{9}+\dfrac{3}{4}=\dfrac{36}{63}+\dfrac{3}{4}=\dfrac{4}{7}+\dfrac{3}{4}=\dfrac{37}{28}\)

c) \(120\times34-100\times34+34\times80\)

\(=34\times\left(120-100+80\right)\)

\(=34\times\left(20+80\right)\)

\(=34\times100\)

\(=3400\)