∫-2,4[（y+4）-1/2y²]dy
=(1/2y²+4y-1/6y³)|-2,4
=(8+16-32/3)-(2-8-4/3)
=40/3-(-22/3)
=62/3确定正确么绝对正确求由方程x平方+y平方+z平方-2x+2y-4z-10=0确定函数z=f的极值这是另一个题目，先采纳后再解决