题目

递等式计算,能简便计算的就简便计算,请看补充,谢谢
①2.7×4.3+27×0.48+0.27×8
②3.6×7.2+3.6×1.1-8.3×2.6
③3.56×3.5+0.356×65

提问时间：2021-03-31

答案

(1) 2.7×4.3 + 27 ×0.48 + 0.27 ×8
=2.7×4.3 + 2.7×4.8 + 2.7×0.8
=2.7(4.3 + 4.8 + 0.8) = 2.7 ×9.9 =2.7×(10-0.1)=2.7×10 - 2.7×0.1 =27 - 0.27 =26.73
(2) 3.6×7.2 + 3.6×1.1-8.3×2.6
=3.6×(7.2 + 1.1) - 8.3×2.6
=3.6×8.3 - 8.3×2.6
=8.3(3.6 - 2.6) = 8.3
(3) 3.56×3.5 + 0.356×65
= 3.56×3.5 + 3.56×6.5
= 3.56×(3.5 + 6.5)
= 3.56×10 = 35.6