问题
解答题
计算：2tan45°sin220°+2sin270°．
答案
原式=2×1×sin220°+2sin270°
=2（sin220°+cos220°）
=2×1
=2．
搜题请搜索小程序“爱下问搜题”
计算：2tan45°sin220°+2sin270°．
原式=2×1×sin220°+2sin270°
=2（sin220°+cos220°）
=2×1
=2．
Children find meanings in their old family tales. When Stephen Guyer’s three children were growing up, he told them stories about how his grandfather, a banker, all in the 1930s, but did not lose sight of what he valued most. In one of the darkest times when his strong-minded grandfather was nearly , he loaded his family into the car and them to see family members in Canada with a , “There are more important things in life than money.” The took on a new meaning recently when Mr. Guyer downsized to a house from a more expensive and comfortable one. He was that his children, a daughter, 15, and twins, 22, would be upset. To his surprise, they weren’t. Instead, their reaction echoed (重复) their great-grandfather’s. What they about was how warm the people were in the house and how much of their heart was accessible. Many parents are finding family stories have surprising power to help children through times. Storytelling experts say the phenomenon (现象) reflects a growing in telling tales, evidenced (证明) by a rise in storytelling events and festivals. A university of 65 families with children aged from 14 to 16 found kids’ ability to parents’ stories was linked to a lower rate of anger and anxiety. The is telling the stories in a way children can hear. We’re not talking here about the kind of story that , “When I was a kid, I walked to school every day uphill both ways, barefoot in the snow.” Instead, we should choose a story suited (适合) to the child’s , and make eye contact to create “a personal experience”. We don’t have to tell children what they should take from the story and what the moral is.
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