若3◎2=3×5-2×2,0.5◎0.7=0.5×5-0.7×2,…那么,A◎B=5A-2B,试计算( 1.2◎1.5 )◎7=_.

问题描述:

若3◎2=3×5-2×2,0.5◎0.7=0.5×5-0.7×2,…那么,A◎B=5A-2B,试计算( 1.2◎1.5 )◎7=______.

1.2◎1.5=5×1.2-2×1.5,
=6-3,
=3,
( 1.2◎1.5 )◎7,
=3◎7,
=5×3-2×7,
=15-14,
=1;
故答案为:1.