As shown in the following illustration．There is some water in the sealed container and the height from the bottom to the surface of the water is 10cm，if we put the container upside down，What’s the height（cm） from the surface of the water to the bottom？ 如圖所示，在密封的容器中裝有一些水，水面到底部的高度是10厘米，如果將這個(gè)容器倒過來，請(qǐng)你求出水面到底部的高度是多少厘米？
You have 3 weights：1 kg，3 kg and 9 kg as well as an equal arm balance，as shown．How many different weight objects can you weigh with these three？[Remember the weights may be placed on either side] 翻譯：你有3個(gè)砝碼：1公斤、3公斤和9公斤，以及一個(gè)托盤天平，你可以稱出多少個(gè)不同的重量？（記住砝碼可以放在天邊兩邊的任意一邊）
You have 3 weights：1 kg，3 kg and 9 kg as well as an equal arm balance，as shown．How many different weight objects can you weigh with these three？[Remember the weights may be placed on either side] 翻譯：你有3個(gè)砝碼：1公斤、3公斤和9公斤，以及一個(gè)托盤天平，你可以稱出多少個(gè)不同的重量？（記住砝碼可以放在天邊兩邊的任意一邊）
There is 1000grams of alcohol solution with the concentration of 15% in the bottle，and now we pour 200grams of alcohol solution A and 400grams of alcohol solution B respectively，the concentration turns to 14%．the concentration of A is twice as much as the concentration of B．What’s the concentration of alcohol solution A？ 瓶中裝有濃度為15%的酒精溶液1000克，現(xiàn)在又分別倒入200克和400克的A、B兩種酒精溶液，瓶中的濃度變?yōu)?4%．已知A種酒精溶液是B種酒精溶液濃度的2倍，那么A種酒精溶液的濃度是多少？
As shown below，the area of the parallelogram ABCD is 54cm2，E，F(xiàn) trisect CA and BA，the area of the shadow is
As shown in the following illustration．There is some water in the sealed container and the height from the bottom to the surface of the water is 10cm，if we put the container upside down，What’s the height（cm） from the surface of the water to the bottom？
如圖，一個(gè)邊長是5厘米的正方體，是由125個(gè)邊長為1厘米的小正方體組成的．P為上底面ABCD的對(duì)角線的交點(diǎn)．分別用通過P、E、F三點(diǎn)的平面，P、F、G三點(diǎn)的平面，P、H、G三點(diǎn)的平面，P、H、E三點(diǎn)的平面把正方體切開，則最后剩下的立體圖形中包含
如圖，正方形ABCD的邊長為8厘米，E，F(xiàn)是邊上的兩點(diǎn)，且AE=3厘米，AF=4厘米，在正方形的邊界上再選一點(diǎn)P，使得三角形EFP的面積盡可能大，這個(gè)面積的最大值是
在邊長為6厘米的正方形ABCD內(nèi)任取一點(diǎn)P，將正方形的一組對(duì)邊二等分，另一組對(duì)邊三等分，分別與P點(diǎn)連接，求陰影部分面積．
如圖，正六邊形ABCDEF的面積是6平方厘米，M、N、P分別是所在邊的中點(diǎn)，則三角形MNP的面積是
如圖，在A、B位于直線L的同側(cè)，在L上找一點(diǎn)P，使得AP+PB最短．
如圖，半圓周上任意一點(diǎn)P，連接AP、BP，∠APB的度數(shù)是（ ）
小學(xué)二年級(jí)奧數(shù)天天練：分別計(jì)數(shù)P，S，C．