Question

胖胖买2支钢笔和5本练习本付出4.8元,还欠0、8元,每支钢笔的价钱比4本练习本还贵0.2元,每本练习本（）

Answer 1

设钢笔为x,练习本为y.

2x+5y=4.8+0.8

2x+5y=5.6

x=4y+0.2

(4y+0.2)2+5y=5.6

8y+0.4+5y=5.6

13y=5.6

y=5.6/13

y=0.43

x=0.43乘以4+0.2