问题 填空题

(1)(3a-4)-3×(a-4)=______

(2)已知a-12=c,那么(a+c+12)÷a=______.

答案

(1)(3a-4)-3×(a-4)

=3a-4-3a+12

=(3a-3a)+(12-4)

=0+8

=8;

(2)a-12=c,即c=a-12,

则(a+c+12)÷a

=(a+a-12+12)÷a

=2a÷a

=2.

选择题
单项选择题