Question

设a*b表示a的3倍减去b的2倍,即a*b=3A-2B,例如当A=6,B=5时,6*5=3乘6-2乘5=8

Answer 1

设a*b表示a的3倍减去b的2倍,即a*b=3A-2B,例如当A=6,B=5时,6*5=3乘6-2乘5=8
(1)计算(2*3)*4;
=(3*2-2*3)
*4
=0
*4
=3*0-2*4
=-8
2*(3*4);
=2*(3*3-2*4)
=2*1
=3*2-2*1
=4