Question

Proportiile : x/4=5/y ; x/7=6/y ; x/5=9/y ; 8/x=y/9 ; 6/x=y/9 ; 4/x=y/7 . La toate calculati x × y.

Answer 1

x/4=5/y    => xy=4*5=20   => 20/4=5/1   => 5=5

x/7=6/y    =>xy=7*6=42    => 42/7=6/1    => 6=6

x/5=9/y    =>xy=45          => 45/5=9/1      => 9=9

8/x=y/9    =>xy=72           => 8/1=72/9      => 8=8

6/x=y/9    => xy=54         => 6/1=54/9      => 6=6

4/x=y/7     =>xy=28         => 4/1=28/7       => 4=4

Answer 2

x / 4 = 5 / y  ⇒  x × y = 4 × 5 = 20

x / 7 = 6 / y  ⇒  x × y = 7 × 6 = 42

x / 5 = 9 / y  ⇒  x × y = 5 × 9 = 45

8 / x = y / 9  ⇒  x × y = 8 × 9 = 72

6 / x = y / 9  ⇒  x × y = 6 × 9 = 54

4 / x = y / 7  ⇒  x × y = 4 × 7 = 28