分析:(1)求一個數(shù)里面有幾個另一個數(shù),用除法解答;
(2)求7.5的百分之二十五,用“7.5×0.25”解答即可;
(3)求一個數(shù)是另一個數(shù)的幾倍,用除法解答;
(4)根據(jù)題意可知:已知一個數(shù)的1.2倍是(36-6)千克,求這個數(shù),用除法解答.
解答:解:(1)0.8÷0.01=80;
(2)7.5×0.25=1.875;
(3)6.3÷1.8=3.5(倍);
(4)(36-6)÷1.2,
=30÷1.2,
=25(千克);
故答案為:80,1.875,3.5,25kg.
點評:解答此題用到的知識點:(1)小數(shù)乘法的意義;(2)已知一個數(shù)的幾倍是多少,求這個數(shù),用除法解答.