问题
填空题
△ABC中,a、b、c分别∠A、∠B、∠C所对的边长,且满足条件c=2,b=2,△ABC面积的最大值为______.
答案
因为△ABC中,a、b、c分别∠A、∠B、∠C所对的边长,且满足条件c=2,b=2,
S△ABC=
×b×csinA=2sinA≤2,1 2
当A=90°时取等号,三角形的面积最大.
故答案为:2.
△ABC中,a、b、c分别∠A、∠B、∠C所对的边长,且满足条件c=2,b=2,△ABC面积的最大值为______.
因为△ABC中,a、b、c分别∠A、∠B、∠C所对的边长,且满足条件c=2,b=2,
S△ABC=
×b×csinA=2sinA≤2,1 2
当A=90°时取等号,三角形的面积最大.
故答案为:2.
Look and choose. 看图,选择正确的一项。 |
1. your sneakers. Run in the park. |
[ ] |
A. Put on |
2. Put on your sandals. your toes. |
[ ] |
A. wiggle B. Run C. Wiggle D. Dance | ![]() |
3. — How much are these boots? — They are . |
[ ] |
A. one hundred B. one hundred yuan C. new D. small | ![]() |
4. Look at this jacket. It's (新的) and (黄的) . |
[ ] |
A. old; yellow B. new; yellow C. old; red D. old; blue |
5. Look at this shirt. It's . |
[ ] |
A. monkey B. elephant's C. pandas' D. man |
6. Look, these shoes are too . |
[ ] |
A. little B. small C. big D. cheap | ![]() |
7. Can I you? |
[ ] |
A. to B. ask C. help D. for |
8. These are many . |
[ ] |
A. watermelons B. bananas C. oranges D. apples | ![]() |