Câu 5: Trang 118 sgk toán tiếng Anh lớp 4
Calculate:
Tính (theo mẫu):
a) $\frac{15\times 7}{30\times 11}$
b) $\frac{4\times 5\times 6}{12\times 15\times 9}$
c) $\frac{6\times 8\times 11}{33\times 16}$
Bài Làm:
Instuctions:
Hướng dẫn: Mẫu:$\frac{15\times 7}{30\times 11}$= $\frac{15\times 7}{15\times 2\times 11}$=$\frac{7}{22}$
Kết quả như sau:
b) $\frac{4\times 5\times 6}{12\times 15\times 9}$= $\frac{4\times 5\times 2\times 3}{3\times 4\times 5\times 3\times 9}$ = $\frac{2}{27}$
c) $\frac{6\times 8\times 11}{33\times 16}$=$\frac{2\times 3\times 8\times 11}{3\times 11\times 2\times 8}$=1