题目内容
7a+8a-a+1=15a+1
改正：
×
×
（判断对错）改正：
7a+8a-a+1=14a+1
7a+8a-a+1=14a+1
．分析：因为7a+8a-a+1=（7+8-1）a+1=14a-1，据此解答即可．
解答：解：7a+8a-a+1，
=（7+8-1）a+1，
=14a+1；
所以题干说法错误．
故答案为：×；7a+8a-a+1=14a+1．
=（7+8-1）a+1，
=14a+1；
所以题干说法错误．
故答案为：×；7a+8a-a+1=14a+1．
点评：解决本题要用乘法分配律计算含有字母的算式．
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