问题
解答题
先化简，再求值．2m-{-3n+[4n-2（3m-n）-2n]}，其中m=
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答案
原式=2m-（-3n+4n-6m+2n-2n）
=2m+3n-4n+6m
=8m-n，
当m=
，n=-1时，原式=8×1 2
-（-1）=4+1=5．1 2
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先化简，再求值．2m-{-3n+[4n-2（3m-n）-2n]}，其中m=
|
原式=2m-（-3n+4n-6m+2n-2n）
=2m+3n-4n+6m
=8m-n，
当m=
，n=-1时，原式=8×1 2
-（-1）=4+1=5．1 2
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| I was tired and hungry after a long day of work. When I walked into the livingroom, my 12yearold son looked up at me and said, "I__1__you." I did not__2__what to say, and I just stood there, looking __3__at him. My first__4__was that he__5__need help with his homework. Then I asked, "What was that all__6__?" "Nothing," he said, "My teacher said we should tell our parents we love them and__7__what they say." The next day I called his teacher to__8__more about what my son said and how the other parents had reacted( 反应). "Most of the fathers had the__9__response as you did," the teacher said, "When I first__10__that we try this, I asked the children__11 _they thought their parents__12__say. Some of them thought their parents would have heart trouble." Then the teacher__13__, " I want my students to know that feeling love is an important part of __14__. I'm trying to tell them it's too bad that we don't express our feelings. A boy__15__tell his father or mother he loves him or her." The teacher understands that sometimes it is__16 _for some of us to say something that is good for us to say. That evening when my son__17__to me, I took him in my arms and held on for an__18 _moment, saying, "Hey, I love you,__19__." I don't know if saying that made__20__of us healthier, but it did feel pretty good. | ||||
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