题目: 证明:多项式16+a-{8a-[a-9-3(1-2a)]}的值与字母a的取值无关. 答案: 证明:16+a-{8a-[a-9-3(1-2a)]}=16+a-{8a-[a-9-3+6a]}=16+a-{8a-a+9+3+6a}=16+a-8a+a-9-3+6a=4.故多项式的值与a的值无关.
题型:补全对话,情景问答 Read and write. A: 1. ?B: I have a headacheA : 2. ? B: I feel sick.A: 3. ?B: My father is 32 years old.A: 4. ?B: No, he is younger than me.A: 5. ? B: I'm 45 kg. 查看答案