设ab都表示数,规定a△b=3*a-2*b
1)求3△2 , 2△3
2)求(17△6)△2, 17△(6△2) ;
①3△2=3*3-2*2=9-4=5
2△3=3*2-2*3=6-6=0
②(17△6)△2
=(3*17-2*6)△2
=39△2
=3*39-2*2
=113
17△(6△2)
=17△(3*6-2*2)
=17△14
=3*17-2*14
=23
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1)求3△2 , 2△3
2)求(17△6)△2, 17△(6△2) ;
①3△2=3*3-2*2=9-4=5
2△3=3*2-2*3=6-6=0
②(17△6)△2
=(3*17-2*6)△2
=39△2
=3*39-2*2
=113
17△(6△2)
=17△(3*6-2*2)
=17△14
=3*17-2*14
=23