若Ix+2I+Iy+3I=0,求2x²-y+1的值.
问题描述:
若Ix+2I+Iy+3I=0,求2x²-y+1的值.
答
x+2=0,y+3=0
所以x=-2,y=-3
则原式=2*(-2)的平方-(-3)+1
=8+4+3
=12
答
Ix+2I+Iy+3I=0
那么x+2=0 y+3=0
x= -2 y= -3
2x²-y+1
=2×4-(-3)+1
=8+3+1
=12