The Spring Festival is coming; I'll _______ up my room. I don't want to live in a dirty room.
A:look
B:clean
C:set
D:turn
己知∠AOB为锐角,| OA→ |=2,| OB→ |=1,OM平分∠AOB,M在线段AB上,点N为线段AB的中点, OP→ =x OA→ +y OB→ ,若点P在△MON内(含边界),则在下列关于x,y的式子①y﹣x≥0; ②0≤x+y≤1; ③2x﹣y≤0; ④0≤x≤ 12 ,0≤y≤ 23 中,正确的是____(请填写所有正确式子的序号)
小静对厨房中下列物质及其主要成分的物质类别进行了分析,其中正确的是( )
472-398=
1112 + 56 =
84.84 ÷ 0.84=
25% × 4=
5.2+8=
2.5-0.36-0.64=
625 × 512 =
5×4 ÷ 5×4=
3.54+0.74-2.54=
38 × 54 + 54 × 58 =