Question

Tìm x biết:   123 : x + 12 : x = 4,5

Tìm x biết:    89 : x – 5,15 : x = 62,5

Cứu

Answer 1

\(a,123:x+12:x=4,5\\ \Rightarrow\left(123+12\right):x=4,5\\ \Rightarrow135:x=4,5\\ \Rightarrow x=30\\ b,89:x-5,15:x=62,5\\ \Rightarrow\left(89-5,15\right):x=62,5\\ \Rightarrow83,85:x=62,5\\ \Rightarrow x=1,3416\)

Answer 2

\(a,\Rightarrow\left(123+12\right):x=4,5\\ \Rightarrow135:x=4,5\\ \Rightarrow x=135:4,5=30\\ b,\Rightarrow\left(89-5,15\right):x=62,5\\ \Rightarrow83,85:x=62,5\\ \Rightarrow x=83,85:62,5=1,3416\)