Happy winter vacation Grade 8 Math p24 1 1 Question 1 1. A mobile company provides two kinds of communication services. GoTone pays the basic fee of 50 yuan in advance every month. Then speak at 0.4 p
Happy winter vacation Grade 8 Math p24 1 1 Question 1 1. A mobile company provides two kinds of communication services. GoTone pays the basic fee of 50 yuan in advance every month. Then speak at 0.4 per minute.
Global y 1
Shenzhouxing y2
( 1)y 1=50+0.4x
y2=0.6x(x 120
∴ Choosing the communication mode of Shenzhouxing is cost-effective.