Question

1 + 1 = 1 · 1
5 · 1 = 5 + 0
3 + 1 = 3 · 0
7 · 1 · 0 = 7 + 1 + 0

Explanation:

Step1: Evaluate first equation

$1+1=2$, $1\cdot1=1$; $2
eq1$

Step2: Evaluate second equation

$5\cdot1=5$, $5+0=5$; $5=5$

Step3: Evaluate third equation

$3+1=4$, $3\cdot0=0$; $4
eq0$

Step4: Evaluate fourth equation

$7\cdot1\cdot0=0$, $7+1+0=8$; $0
eq8$

Answer:

$5\cdot1=5+0$