化简求值:2(-3a+2)(5a-1)+(6a-5)(3+5a),其中a=1/5

问题描述:

化简求值:2(-3a+2)(5a-1)+(6a-5)(3+5a),其中a=1/5

2(-3a+2)(5a-1)+(6a-5)(3+5a)
=2(-15a²+13a-2)+(30a²-7a-15)
=-30a²+26a-4+30a²-7a-15
=19a-19
=19(a-1)
=19*(1/5-1)
=-76/5