Câu 2: Trang 130 sách giáo khoa (SGK) toán tiếng Anh lớp 4Simplify then calculate:Rút gọn rồi...

{
"answer1": "a) Simplify: \( \frac{20}{16} - \frac{3}{4} = \frac{5}{4} - \frac{3}{4} = \frac{5 - 3}{4} = \frac{2}{4} = \frac{1}{2} \), Calculate: \( \frac{1}{2} = 0.5 \)",
"answer2": "b) Simplify: \( \frac{30}{45} - \frac{2}{5} = \frac{2}{3} - \frac{2}{5} = \frac{10}{15} - \frac{6}{15} = \frac{10 - 6}{15} = \frac{4}{15} \), Calculate: \( \frac{4}{15} \approx 0.2667 \)",
"answer3": "c) Simplify: \( \frac{10}{12} - \frac{3}{4} = \frac{5}{6} - \frac{3}{4} = \frac{10}{12} - \frac{3 \times 2}{4 \times 2} = \frac{5}{6} - \frac{6}{8} = \frac{5}{6} - \frac{3}{4} = \frac{10}{12} - \frac{9}{12} = \frac{1}{12} \), Calculate: \( \frac{1}{12} \approx 0.0833 \)",
"answer4": "d) Simplify: \( \frac{12}{9} - \frac{1}{4} = \frac{4}{3} - \frac{1}{4} = \frac{16}{12} - \frac{3}{12} = \frac{16 - 3}{12} = \frac{13}{12} \), Calculate: \( \frac{13}{12} \approx 1.0833 \)"
}