Question

对于数a,b,规定运算“△”为a△b=（a+3）×（b-5）.求(1)3△6；（2）5△（6△7）.

Answer 1

3△6

=(3+3)*(6-5)

=6*1

=6

5△（6△7）

=5△（6+3)(7-5)

=5△(9*2)

=5△18

=(5+3)(18-5)

=8*13

=104