Question

Efetue as multiplicações e simplifique os resultados quando possível :
A) 2/7×1/4
B) 2/3×1/5
C) 1/8×4/8
D) 9/5×6/18
E) 4/6×3/21
F) 12/5×10/24
G) 15/20×7/21
I) 70/14×55/100
J) 144/27×30/72

Answer 1

Explicação passo-a-passo:

A)

$\dfrac{2}{7} \times \dfrac{1}{4}$

$\dfrac{2 {}^{ \div 2} }{28 {}^{ \div 2} }$

$\dfrac{1}{14}$

B)

$\dfrac{2}{3} \times \dfrac{1}{5}$

$\dfrac{2 \times 1}{3 \times 5}$

$\dfrac{2}{15}$

C)

$\dfrac{1}{8} \times \dfrac{4}{9}$

$\dfrac{4 {}^{ \div 4} }{72 {}^{ \div 4} }$

$\dfrac{1}{18}$

D)

$\dfrac{9}{5} \times \dfrac{6}{18}$

$\dfrac{54 {}^{ \div 18} }{90 {}^{ \div 8} }$

$\dfrac{3}{5}$

E)

$\dfrac{4}{6} \times \dfrac{3}{21}$

$\dfrac{12 {}^{ \div 6} }{126 {}^{ \div 6} }$

$\dfrac{2}{21}$

F)

$\dfrac{12}{5} \times \dfrac{10}{24}$

$\dfrac{120}{120}$

$1$

G)

$\dfrac{15}{20} \times \dfrac{7}{21}$

$\dfrac{105 {}^{ \div 105} }{420 {}^{ \div 105} }$

$\dfrac{1}{4}$

H)

$\dfrac{16}{51} \times \dfrac{18}{48}$

$\dfrac{288 {}^{ \div 144} }{2448 {}^{ \div 144} }$

$\dfrac{2}{17}$

I)

$\dfrac{70}{14} \times \dfrac{55}{100}$

$\dfrac{3850 {}^{ \div 350} }{1400 {}^{ \div 350} }$

$\dfrac{11}{4}$

J)

$\dfrac{144}{27} \times \dfrac{30}{72}$

$\dfrac{4320 {}^{ \div 216} }{1944 {}^{ \div 216} }$

$\dfrac{20}{9}$