比30千米多20%是_千米; 20吨比_吨少60%; 30千克比50千克少_%; _米比20米多30%.
问题描述:
比30千米多20%是______千米; | 20吨比______吨少60%; |
30千克比50千克少______%; | ______米比20米多30%. |
答
(1)30×(1+20%),
=30×1.2,
=36(千米);
(2)20÷(1-60%),
=20÷40%,
=50(吨);
(3)(50-30)÷50,
=20÷50,
=40%;
(4)20×(1+30%),
=20×1.3,
=26(米).
故答案为:36,50,40,26.