●+▲=46

●+■=9 1

▲+■=63

●+▲+●+■+▲+■=46+9 1+63=200

●+▲+■= 100

●+▲ =46

■= 100-46=54

●+▲+■= 100

● +■=9 1

▲ = 100-9 1=9

●+▲+■= 100

▲+■=63

● = 100-63=37

⒉

If Xiaoming bought 35 20-cent stamps: 0.2 yuan × 35 = 7 yuan.

Less flowers: 10-7 = 3 yuan.

So the stamps Xiao Minghua bought in 0.5 yuan are: 3 ÷ (0.5-0.2) = 10 (sheet).

The stamps bought by Xiao Minghua in 0.2 yuan are: 35- 10 = 25 (sheets).

Or:

If Xiaoming bought 35 50-cent stamps: 0.5 yuan× 35 =17.5 yuan.

Spend too much: 17.5- 10 = 7.5 (yuan)

The stamps bought by Xiao Minghua in 0.2 yuan are: 7.5 ÷ (0.5-0.2) = 25 (sheets).

The stamp Xiao Minghua bought in 0.5 yuan is: 35-25 = 10 (sheet).