Câu 1: trang 176 - toán tiếng Anh 5
Calculate:
Tính:
a) 683 x 35;
1954 x 425 ;
2438 x 306 ;
b) \(\frac{7}{9}\)x \(\frac{3}{35}\) ;
\(\frac{9}{22}\) x 55 ;
\(\frac{11}{17}\) : \(\frac{33}{34}\) ;
c) 36,66 : 7,8 ;
15,7 : 6,28 ;
27,63 : 0,45 ;
d) 16 hours 15 minutes : 5 ;
16 giờ 15 phút : 5 ;
14 minutes 36 seconds : 12.
14 phút 36 giây : 12.
Bài Làm:
a)
683 x 35 = 23905
1954 x 425 = 830450
2438 x 306 = 746028
b) \(\frac{7}{9}\) x \(\frac{3}{35}\) = \(\frac{7 \times 3}{9 \times 35}\) = \(\frac{7 \times 3}{3 \times 3 \times 5 \times 7}\) = \(\frac{1}{3 \times 5}\) = \(\frac{1}{15}\)
\(\frac{9}{22}\) x 55 = \(\frac{9 \times 55}{22}\) = \(\frac{9 \times 5 \times 11}{2 \times 11}\) = \(\frac{9 \times 5}{2}\) = \(\frac{45}{2}\)
\(\frac{11}{17}\) : \(\frac{33}{34}\) = \(\frac{11}{17}\) x \(\frac{34}{33}\) = \(\frac{11 \times 34}{17 \times 33}\) = \(\frac{11 \times 2 \times 17}{17 \times 3 \times 11}\) = \(\frac{2}{3}\)
d)
16 hours 15 minutes : 5 = 3 hours 15 minutes
16 giờ 15 phút : 5 = 3 giờ 15 phút
14 minutes 36 seconds : 12 = 1 minute 13 seconds
14 phút 36 giây : 12 = 1 phút 13 giây