当x=3 y=1.2时4x²-3y=( )
问题描述:
当x=3 y=1.2时4x²-3y=( )
答
=4×9-3×1.2
=36-3.6
=32.4
当x=3 y=1.2时4x²-3y=( )
=4×9-3×1.2
=36-3.6
=32.4