Width: 6.5×4=26 cm
Height:1/kloc-0 /×1=11(cm)
2.3. 14× 1.6×5 = 25. 12(m? )
3.3. 14×6× 1.2 = 22.608(m? )
3. 14×(6÷2)? =28.26(m? )
22.608+28.26=50.868(m? )
4.3. 14×20×50=3 140(cm? )
5.3. 14×0.6× 1 = 1.884(m? )
3. 14×(0.6÷2)? ×2=0.5652(m? )
1.884+0.5652=2.4492(m? )
2.4492×0.2=0.48984 kg ≈0.49 kg.
6.2×3. 14×3× 10 = 188.4(cm? )
1 m2 = 10000 cm2
10000÷ 188.4≈53 (pieces)
7.3. 14×(3÷2)? ×4=28.26(dm? ) =28.26 (liter)
8. 12.56÷3. 14÷2=2 cm
3. 14×2? × 100= 1256(cm? )
9.3. 14×( 14÷2)? ×20=3077.2(cm? ) =3077.2 (ml)
3077.2>3000
Answer: It can hold 3000 ml of milk.
10.? 80 cm = 0.8 m
2×0.8= 1.6(m? )
1.6×600=960 (kg)
1 1. Cube: 4×4×4=64(dm? )
? Cylinder: 3. 14×2? ×4=50.24(dm? )
? 64>50.24
? The cube is very big.
12.3. 14×( 10÷2)? ×2= 157(cm? )
13.( 1) 12.56dm = 1.256m
? 1.256×4=5.024(m? )
? 1.256÷3. 14÷2=0.2 (m)
? 3. 14×0.2? ×2=0.25 12(m? )
? 5.024+0.25 12=5.2752(m? )
? (2)0. 1256×4=0.5024(m? )=50.24(dm? )
? (3)0. 1256×4=0.5024(m? )=50.24(dm? )
? It needs to be cut twice before it can be cut into three sections, and two faces are added for each cut, so four faces are added for one * * * twice, and the bottom area is× 4.
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