30 70 100 4 15 = 8 10 = 12 15 = 20 25 3 7 + 1 6 = 25 42 25 42 − 1 6 = 4 5 × 11 12 = 11 15 11 15 ÷ 4 5 = 27 × 36 27 × 18 = 2 7 × 3 6 = 352 × 48 = 16896 16896 ÷ 24 = 0 427 6 20 15 − 3 × 7 = −6 3 + 5 × 4[.]
Trang 215 ÷
4
5 =
Trang 46
20
Trang 79, 2, 8, 3
Trang 10+ –
123 45 67 89 = 100
Trang 11180 = 2 × 2 × 3 × 3 × 5
Trang 124𝑥 − 5 = 2𝑥 + 1
𝑥
Trang 20𝒏 = 𝟏
𝒏 = 𝟒