There is a simple problem, please help me to do 4 / 5 + 9 and 4 / 5 + 99 and 4 / 5 + 999 and 4 / 5 + 9999 and 4 / 5

There is a simple problem, please help me to do 4 / 5 + 9 and 4 / 5 + 99 and 4 / 5 + 999 and 4 / 5 + 9999 and 4 / 5


4 / 5 + 9 and 4 / 5 + 99 and 4 / 5 + 999 and 4 / 5 + 9999 and 4 / 5
=4/5(1+9+99+999+9999)
=19999 4 / 5



100 points!
1.25/4÷9/4×63/50
2.3÷8/3-8/3÷3
3.((4/5-(16/7+4/1)))÷4/3
4.9/7÷39+3/2×39/1
Can do a few questions is a few questions!


1.25/4÷9/4×63/50 = 7/2
2.3÷8/3-8/3÷3 = 5/24
3.((4/5-(16/7+4/1)))÷4/3 = -144/35
4.9/7÷39+3/2×39/1 = 10653/182