若式子2x²-3x+1的值是8,则式子4x²-6x-3的值是_____.
问题描述:
若式子2x²-3x+1的值是8,则式子4x²-6x-3的值是_____.
答
4x²-6x-3
=2(2x²-3x+1)-5
=2*8-5
=11