1. 150 1.5 15 15

2.3

3.240 25

4.72 64

5.2×2×2×3×3

6. the problem of 6.LZ missing. . . .

7.8: 8 out of 5

Question 8 is gone again.

9. Two fifths

10.2000 4.2

Second, the application problem

1.(25200-24000)÷24000× 100%=5%

2 questions are missing. . .

3.10 ÷ 2 = 5cm

5×5×3. 14×6=47 1(cm？ )

4.2÷2= 1 (cm)

1× 1×3. 14×75 = 235.5(cm？ )

235.5÷7.8≈30 (g)

5. Solution: Set up three teams to cooperate, and the project can be completed in X days.

1×x+ 15 1×x+ 12 1×x = 1。

( 1+ 10， 1+ 15， 1)x= 1。

1× x= 1。

x=4

6. Solution: Suppose Dong Wang got an X-score.

12 part 1 1× 85+x = x-5.5

12 935+x = x-5.5

65438+935+5.5 = x+ 1.2 x。

X+ 1.2 x = 1.2 935+5.5。

12 part 13x = 4708 part 60.

x = 4708/x = 52

X is about 90.5