在①
;②
;③
;④
;⑤
(a,b为常数)中,是方程的为________ .(填序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc3ab379cd80a132cf19bee4127ae50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af409a83c3a1cba7865d231e170ad529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60a368d97986f1b1af0be764e53108e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f17b382e59a5e5e5d0bd6db76916b9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c66ebcce45b0de24a80f1892d5fc3b2.png)
20-21七年级上·全国·课后作业 查看更多[2]
更新时间:2020-08-27 20:09:27
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【推荐1】下列各式中:
,
;
;
;
;
;
(
且
为常数),若方程个数记为
,一元一次方程个数记为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1977f9960ab51701e84226e00893902.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb1c9b1e3163c5f3dc716a1907fb5a62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3609ef00e216ec8ed114d3423bfb8ce1.png)
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【推荐2】下列不是方程的是________ .(填序号)
①1+2=3; ②2x+1; ③2m+15=3; ④x2-6=0; ⑤3x+2y=9; ⑥3a+9>15.
①1+2=3; ②2x+1; ③2m+15=3; ④x2-6=0; ⑤3x+2y=9; ⑥3a+9>15.
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