Current location - Training Enrollment Network - Mathematics courses - 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 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.