a*b=(a-2b)/(2a-b),则(负3)*(3分之1)等于多少?
问题描述:
a*b=(a-2b)/(2a-b),则(负3)*(3分之1)等于多少?
答
(-3)*(1/3)
=(-3-2×(1/3))/(2×(-3)-1/3)
=(-3-2/3)/(-6-1/3)
=(-11/3)/(-19/3)
=11/19