合并同类项,1.a²b-b²c﹢3a²b﹢2b²c,3.m²-四分之一m﹢1/3﹣二分之一 m²﹢六分之一m-1/5 ,4.求值,5b-九分之二a³b²-九分之四ab﹢二分之一a³b²-四分之十1ab-a
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/20 14:44:02
![合并同类项,1.a²b-b²c﹢3a²b﹢2b²c,3.m²-四分之一m﹢1/3﹣二分之一 m²﹢六分之一m-1/5 ,4.求值,5b-九分之二a³b²-九分之四ab﹢二分之一a³b²-四分之十1ab-a](/uploads/image/z/13332324-12-4.jpg?t=%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9%2C1.a%26%23178%3Bb-b%26%23178%3Bc%EF%B9%A23a%26%23178%3Bb%EF%B9%A22b%26%23178%3Bc%2C3.m%26%23178%3B-%E5%9B%9B%E5%88%86%E4%B9%8B%E4%B8%80m%EF%B9%A21%EF%BC%8F3%EF%B9%A3%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80+m%26%23178%3B%EF%B9%A2%E5%85%AD%E5%88%86%E4%B9%8B%E4%B8%80m%EF%BC%8D1%EF%BC%8F5+%2C4.%E6%B1%82%E5%80%BC%2C5b%EF%BC%8D%E4%B9%9D%E5%88%86%E4%B9%8B%E4%BA%8Ca%26%23179%3Bb%26%23178%3B%EF%BC%8D%E4%B9%9D%E5%88%86%E4%B9%8B%E5%9B%9Bab%EF%B9%A2%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80a%26%23179%3Bb%26%23178%3B%EF%BC%8D%E5%9B%9B%E5%88%86%E4%B9%8B%E5%8D%811ab%EF%BC%8Da%26%23)
合并同类项,1.a²b-b²c﹢3a²b﹢2b²c,3.m²-四分之一m﹢1/3﹣二分之一 m²﹢六分之一m-1/5 ,4.求值,5b-九分之二a³b²-九分之四ab﹢二分之一a³b²-四分之十1ab-a
合并同类项,1.a²b-b²c﹢3a²b﹢2b²c,
3.m²-四分之一m﹢1/3﹣二分之一 m²﹢六分之一m-1/5 ,4.求值,5b-九分之二a³b²-九分之四ab﹢二分之一a³b²-四分之十1ab-a³b-5其中a=1,b=-2.
合并同类项,1.a²b-b²c﹢3a²b﹢2b²c,3.m²-四分之一m﹢1/3﹣二分之一 m²﹢六分之一m-1/5 ,4.求值,5b-九分之二a³b²-九分之四ab﹢二分之一a³b²-四分之十1ab-a
合并同类项,
1.a²b-b²c﹢3a²b﹢2b²c,
=(a²b﹢3a²b)+(-b²c﹢2b²c)
=4a²b+b²c
3.m²-四分之一m﹢1/3﹣二分之一 m²﹢六分之一m-1/5 ,
=(m²-1/2m²)+( -1/4m+1/6m) +(1/3-1/5)
=1/2m²-1/12m+2/15
4.求值,5b-九分之二a³b²-九分之四ab﹢二分之一a³b²-四分之十1ab-a³b-5其中a=1,b=-2.
5b-九分之二a³b²-九分之四ab﹢二分之一a³b²-四分之十1ab-a³b-5
=5×(-2)-2/9×1³×(-2)²-4/9×1×(-2)+1/2×1³×(-2)²-11/4×1×(-2)-1²×(-2)-5
=-10-8/9+8/9+2+11/2+2-5
=-5又2分之1
a²b-b²c﹢3a²b﹢2b²c =a²b+3a²b-b²c+2b²c =4a²b+b²c 3.m²-1/4 m﹢1/3﹣1/2 m²﹢1/6 m-1/5 &nb...
全部展开
a²b-b²c﹢3a²b﹢2b²c =a²b+3a²b-b²c+2b²c =4a²b+b²c 3.m²-1/4 m﹢1/3﹣1/2 m²﹢1/6 m-1/5 , =1/2 m²-1/12 m+2/15 4.5b-九分之二a³b²-九分之四ab﹢二分之一a³b²-四分之十1ab-a³b-5 =5×(-2)-2/9×1³×(-2)²-4/9×1×(-2)+1/2×1³×(-2)²-11/4×1×(-2)-1²×(-2)-5 (望采纳。
=(m²-1/2 m²)+( -1/4 m+1/6 m) +(1/3-1/5)
=-10-8/9+8/9+2+11/2+2-5
收起