1.360*3%= 10.8 (ten thousand yuan)

2.840* 17%= 142.8 (ten thousand yuan)

3.5000*( 1-20%)=4000 yuan.

4. 1800- 1600=200 (yuan)

200*5%= 10 (yuan) mom

2500- 1600=900 (yuan)

900-500=400 (yuan)

500*5%=25 (yuan)

Two:

1, handle part of flashlight, lower part of column, middle of the third picture.

2, the first and the fourth.

3. The first rectangle, the second square and the third cylinder.

4. The first picture.

1.1.6× 0.7 =1.12 (square meter) 2, 3.2× 2× 3.14× 5 =100.48 (square decimeter).

6.12× 3.14× (2+16) = 683.24 (square centimeter) 5×3. 14×(2+20)=345.4 (square centimeter)/

7.1.2× 3.14× 2 = 7.536 (m2)

8.1.5× 3.14× 2.5 =11.475 (m2)

9.3× 3.14× (1+2) = 28.26 (square meter)

10,8× 3.14× (1+13) = 351.68 (square centimeter)

1 1, the first one above and the third one below, the second one above and the first one below, the third one above and the first one below.

12, such as hawthorn bottle. Height 10cm, bottom diameter 8cm. The solution is: 3.14×10× 8 = 251.2 (cm2) 3.14× (8 ÷ 2) squared × 2 = 10.

13 、( 10× 10+ 10× 15+ 10× 15)×2=800

14、24×3. 14×8=602.88 602.88+24×3. 14×2=7 15.92

3. 14×5= 15.7 3. 14÷3. 14÷2=0.5 0.5×0.5×3. 14=0.785 0.785×2+ 15.7= 17.27

2.5×2×3. 14×5=78.5 2.5×2.5×3. 14+78.5=98. 125

Three:

1.2 1m3 22.4m3

2.3.14× 5× 2× 2 = 62.8 (cm3) 3.14× (4 \ 2) ×12 squared = 150.72(cm3).

3. The square of14× (8 \ 2) × 8 = 40 1.92 (cm3)

3.3. The square of14× (56 \ 2) × 87 = 246 1.76 (cm3)

4.3. The square of14× (3 \ 2) ×0.5×2=7.065(cm3)

5.8016 = 5cm

6. V: 3.14× (6 \ 2 )×12 squared =339. 12(cm3).

S:3. 14×(6 \ 2)×2+s squared: 3.14× (6 \ 212 = 282 (cm2

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