Question

2) ( Efetue as multiplicações a seguir: a) (- 5 ) x (- 2 ) = c) (+0,7) x (+0,5) ( 7 ) ( 9 ) b) (- 4) x (+3) = d) 0,2 x 1,32 ( 5 ) ( 7 )
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Answer 1

Explicação passo-a-passo:

.

$2)a) - \dfrac{5}{7} \times - \dfrac{2}{9}$

$\dfrac{10}{63}$

.

$b)0.7 \times 0.5$

$0.35$

.

$c) - \dfrac{4}{5} \times \dfrac{3}{7}$

$- \dfrac{12}{35}$

.

$d)0.2 \times 1.32$

$0.264$

.

$3)a) \dfrac{2}{4} \div - \dfrac{3}{2}$

$\dfrac{2}{4} \times - \dfrac{2}{3}$

$- \dfrac{4}{6}$

$- \dfrac{4 {}^{ \div 2} }{6 {}^{ \div 2} }$

$- \dfrac{2}{3}$

.

$b) \dfrac{1}{4} \div - \dfrac{6}{2}$

$\dfrac{1}{4} \times - \dfrac{2}{6}$

$- \dfrac{2}{24}$

$- \dfrac{2 {}^{ \div 2} }{24 {}^{ \div 2} }$

$- \dfrac{1}{12}$

.

$c) - 3 \div - \dfrac{3}{2}$

$- 3 \times - \dfrac{2 }{3}$

$\dfrac{6}{3}$

$2$

.

$d) \dfrac{12}{7} \div - \dfrac{1}{4}$

$\dfrac{12}{7} \times - \dfrac{4}{1}$

$- \dfrac{48}{7}$