4. Dánh dau √ vào ó tróng dǎt canh cach tinh thuān tien nhat:a)136 × 46+136 × 53+136b)136 × 46+136 × 53+136=6256+7208+136=136 × (46+53+1)=13600.=136 × 100=13600.c)218 ×63-59 ×2 ×63d)218 ×63-59 ×2 ×63=218 × 63-118 × 63=13734-7434=(218-...