化简-5a+(3a-2)-(3a-7)过程详细一点请一步步的讲解1/3(9y-3)怎么化简?
问题描述:
化简-5a+(3a-2)-(3a-7)过程详细一点
请一步步的讲解
1/3(9y-3)怎么化简?
答
-5a+(3a-2)-(3a-7)
=-5a+3a-2-3a+7
=-5a+3a-3a+7-2
==(-5a+3a-3a)+7-2
=-5a+5
1/3(9y-3)=1/3X9y+1/3*(-3)
=3y-1