# 假设法解分数应用题 通川区第八小学　吴培谋 - PowerPoint PPT Presentation

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## 30100

1 1054747

21053838

105384749

(1)4/7

105X4/7=60()

60-49=11()

11(4/7-3/8)=56()

105-5649

5649

105384749

(2)3/8

105X3/8=315/8()

49-315/8=77/8()

77/8(4/7-3/8)=49()

105-4956

5649

• 1

• 4.81/32/51.72

(1)

(1.72-4.8X1/3)(2/5-1/3)=1.8()

4.8-1.8=3()

(2)

4.8X(2/5-1.72)(2/5-1/3)=3()

4.8-3=1.8()

• 2

• 641/41/346

(1)64-46=18()

(18-64X1/4)(1/3-1/4)=24()

64-24=40()

(2)64-46=18()

(64X1/3-18)(1/3-1/4)=40()

64-40=24()

3

7501/61/5710

(1)

[750X(1+1/6)-710] (1/5+1/6)=450()

450X(1-1/5)=360()

710-360=350(

(2)

710-750X(1-1/5)] (1/5+1/6)=300()

300X(1+1/6)=350( )

710-350=360()

193/82/5121