A) 25 × 34 × 4 = 25 × 4 × 34= 100 × 34= 3400B) 128 × 93 + 128 ×...

Câu 3.a) 25 × 34 × 4 = 25 × 4 × 34= 100 × 34= 3400b) 128 × 93 + 128 × 7 = 128 × (93 + 7)= 128 × 100= 12800c) 57 × 63 - 47 × 63 = 63 × (57 - 47)= 63 × 10= 630