营养成分
铁
镁
锌
钙
含量(mg/100g)
4.4~5
90~100
3~4
280~300
The book has no pictures______ stories in it, so the little boy doesn't like it.
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.