规定A*B=3A-2B (1)6*5=___________(2)已知a*9=6,求a
问题描述:
规定A*B=3A-2B (1)6*5=___________(2)已知a*9=6,求a
答
规定A*B=3A-2B
(1)6*5=3×6-2×5
=18-10
=8
(2)已知a*9=6,求a
3×a-2×9=6
3a-18=6
3a=24
a=8