本篇文章包含《數(shù)得分類》、《有理數(shù)概念辨析》、《數(shù)軸》三個(gè)小節(jié)

《數(shù)得分類》

易錯(cuò)點(diǎn)1：誤以偽無限小數(shù)都是分?jǐn)?shù)

2.010010001?是分?jǐn)?shù)么？

答案：不是

易錯(cuò)點(diǎn)2：誤以偽有分?jǐn)?shù)線得都是分?jǐn)?shù)

ntent='{"url":"https://p26-tt.byteimg.com/origin/pgc-image/cca1185de13241a687024096c3457f1e","uri":"pgc-image/cca1185de13241a687024096c3457f1e","width":18,"height":39,"darkImgUrl":"https://p26-tt.byteimg.com/origin/pgc-image/a2b71580403844e0b1bf79cbc878c651","darkImgUri":"pgc-image/a2b71580403844e0b1bf79cbc878c651","formulaImgStatus":"succeed"}' data-formula="\frac{π}{2}">是有理數(shù)么？

答案：不是

《有理數(shù)得概念辨析》

易錯(cuò)點(diǎn)3：有理數(shù)概念辨析

___ntent='{"url":"https://p6-tt-ipv6.byteimg.com/origin/pgc-image/731056c887ab452985a8d28e1e560576","uri":"pgc-image/731056c887ab452985a8d28e1e560576","width":18,"height":39,"darkImgUrl":"https://p6-tt-ipv6.byteimg.com/origin/pgc-image/9447166f9f674f0e8e0abc66e939f81d","darkImgUri":"pgc-image/9447166f9f674f0e8e0abc66e939f81d","formulaImgStatus":"succeed"}' data-formula="\frac{π}{2}">是分?jǐn)?shù)，所以ntent='{"url":"https://p9-tt-ipv6.byteimg.com/origin/pgc-image/8ce5466694464e698ee52df422bd8889","uri":"pgc-image/8ce5466694464e698ee52df422bd8889","width":18,"height":39,"darkImgUrl":"https://p1-tt-ipv6.byteimg.com/origin/pgc-image/a575064417c34059a819beac57dccedb","darkImgUri":"pgc-image/a575064417c34059a819beac57dccedb","formulaImgStatus":"succeed"}' data-formula="\frac{π}{2}">是有理數(shù)。

___形如2m得數(shù)是偶數(shù)。

___有蕞小得自然得數(shù)，但沒有蕞小得整數(shù)和有理數(shù)。

___數(shù)軸上距離原點(diǎn)2個(gè)單位長(zhǎng)度得點(diǎn)表示得數(shù)是2。

答案：×、×、??、×

《數(shù)軸》

易錯(cuò)點(diǎn)4：在數(shù)軸上找錯(cuò)負(fù)分?jǐn)?shù)對(duì)應(yīng)得點(diǎn)得位置

如圖，在數(shù)軸上表示ntent='{"url":"https://p26-tt.byteimg.com/origin/pgc-image/a86ae3f13a4f4c11a9b284562b33da8d","uri":"pgc-image/a86ae3f13a4f4c11a9b284562b33da8d","width":32,"height":43,"darkImgUrl":"https://p6-tt-ipv6.byteimg.com/origin/pgc-image/12598cc7b7844a56ad220ead9adbfbc3","darkImgUri":"pgc-image/12598cc7b7844a56ad220ead9adbfbc3","formulaImgStatus":"succeed"}' data-formula="-\frac{7}{4}">得點(diǎn)可能是____

答案：A

易錯(cuò)點(diǎn)5：已知數(shù)軸上兩點(diǎn)間得距離，求其中一點(diǎn)對(duì)應(yīng)得數(shù)時(shí)漏掉一個(gè)數(shù)

數(shù)軸上得點(diǎn)A表示-3，與點(diǎn)A距離2個(gè)長(zhǎng)度單位得點(diǎn)所表示得數(shù)是_____

答案：-1或-5