简便计算:(309*17+375)⼀84 3.35*6.4*2+6.7*3.6

2024-12-28 14:57:49
推荐回答(1个)
回答1:

(309×17+375)/84
= (3×103×17 + 3×125) / (3×28)
= (103×17 + 125) / 28
= (103×16 + 103 + 125) / 28
= (103×16 + 228) / (4×7)
= (103×4×4 + 57×4) / (4×7)
= (103×4 + 57 ) / 7
= (412 + 57 ) / 7
= (412 + 8 + 49 ) / 7
= (420 + 49 ) / 7
= 60 + 7
= 67

3.35×6.4×2 + 6.7×3.6
= 3.35×2×6.4 + 6.7×3.6
= 6.7×6.4 + 6.7×3.6
= 6.7×(6.4 + 3.6)
= 6.7×10
= 67