如果关于x的多项式 x4+(a-1)x3+5x2-(b+3)x-1不含x3项和x项,求a、b的值.
解:∵关于x的多项式x4+(a-1)x3+5x2-(b+3)x-1不含x3项和x项,∴a-1=0,b+3=0,∴a=1,b=-3.故a的值为1,b的值为-3.
五带划分的界限是南北回归线、赤道和南北极圈.( )(判断对错)
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