a*b=4a+3b,求:(1)2*3;(2)3*(1*5)
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a*b=4a+3b,求:(1)2*3;(2)3*(1*5)
a*b=4a+3b,求:(1)2*3;(2)3*(1*5)
a*b=4a+3b,求:(1)2*3;(2)3*(1*5)
(1)2*3
=4×2+3×3
=8+9
=17
(2)3*(1*5)
=3*(4×1+3×5)
=3*(4+15)
=3*19
=4×3+3×19
=12+57
=69