学校买来30套桌椅,桌子的单价是45元,椅子的单价是18元,学校买桌椅花了多少元?
(45+18)×30,
=63×30,
=1890(元);
答:学校买桌椅花了1890元.
根据句义和所给的首字母完成下列单词。
1. — Where is the bed?
— It's in your b______?
2. — Where is the picture?
— It's a______ the bed.
3. — Where are my shoes?
— They're b______ the bed.
4. — Where is the lamp?
— It's b______ the bed.
5. — Where are my pencils?
— They're i______ your pencil case.
对抗同储是将两种或两种以上的药同储,以防虫防霉的方法。