A:9.8N等于1kg
B:9.8kg等于1N
C:质量是9.8kg的物体受到的重力是1N
D:质量是1kg的物体受到的重力是9.8N
项目
跑步
跳高
跳远
平均分
分数
70
?
85
83
选出相对应的答句。
①What size do you want? ____ A. Yes, she does.
②Does Lulu like rabbits? ____ B. He's a farmer.
③What's your father do? ____ C. Size 25, please.
④Do you have any shoes? ____ D. Yes, I am.
⑤Are you a teacher? ____ E. Yes, we do.
已知x2+x﹣5=0,求代数式(x﹣1)2﹣x(x﹣3)+(x+2)(x﹣2)的值.