No.2 Strawberry 2 yuan 1000

4 yuan of No.3 straw spoon 1kg

Four ways to buy with 12 yuan.

3x+2y+4z= 12

Divide both sides by two.

1.5x+y+3z=9

( 1) x=2

y+3z=9

y=0，z=3

y=3，z=2

y=6，z= 1

y=9，z=0

(2) x=4

y+3z=6。 . . .