a. c = 1; b. c = 0.

Choose the letter A, B, C or D to complete the sentences with given words

I/ can’t/ imagine/ life/ without/ science/ technology.

A. I/ can’t/ imagine/ life/ without/ science/ technology.

B. I can’t imagine our life without science and technology.

C. I can’t imagine our life without science so technology.

D. I can’t imagine our life without science nor technology.

Diện tích hình chữ nhật là :

4 x 5 = 20 ( cm² )

Đáp số: 20 cm²