谁会这道题:用简便方法计算。

2024-12-14 19:27:32
推荐回答(1个)
回答1:

(1)4.5×3.26+9.7×6.74+3.26×5.2
  =3.26×(4.5+5.2)+9.7×6.74  
  =3.26×9.7+9.7×6.74
  =9.7×(3.26+6.74)
  =9.7×10
  =97
(2)11.6×4.2+15.8×5.8+4.2×4.2
  =4.2×(11.6+4.2)+15.8×5.8
  =4.2×15.8+15.8×5.8
  =15.8×(4.2+5.8)
  =15.8×10
  =158
(3)4.02×3.7-0.02×3.7+3.5×4
  =3.7×(4.02-0.02)+3.5×4
  =3.7×4+3.5×4
  =4×(3.7+3.5)
  =4×7.2
  =28.8