英语:
翻译
她的房间里有什么?
改正
3.I not need that notebook.
5.Can you take your video tape to me?
数学
17.若|x-1|+(y+2)^2=0,则x-y=____
19.设n正整数,则(-1)^n+(-1)^n+1/2的值为___
22.某食品厂从生产的袋装食品中抽出样品20袋,检测每袋的质量是否符合标准,超过和不足的部分分别用正、负数来表示,记录如下表:
(1)这批样品的平均质量比标准质量多还是少?多或少几克?
(2)若每袋标准质量为450克,则抽样检测的总质量的多少克?
What does her room have?
I don't need........
Can you spend your viden tape to me?
x=1,y=-2(x-y=3)
(-5)×1+(-2)×4+0×3+1×4+3×5+6×3=(-5)+(-8)+0+4+15+18=24(克)这批样品的平均质量比标准质量多,多24克450×(1+4+3+4+5+3)+24=450×20+24=9000+24=9024(克)抽样品检测的总质量是9024克
What does her room have?
I don't need........
Can you spend your viden tape to me?
x=1,y=-2(x-y=3)