递等式计算,能简便计算的就简便计算,请看补充,谢谢
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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
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
![递等式计算,能简便计算的就简便计算,请看补充,谢谢](/uploads/image/z/5774592-48-2.jpg?t=%E9%80%92%E7%AD%89%E5%BC%8F%E8%AE%A1%E7%AE%97%2C%E8%83%BD%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%E7%9A%84%E5%B0%B1%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%2C%E8%AF%B7%E7%9C%8B%E8%A1%A5%E5%85%85%2C%E8%B0%A2%E8%B0%A2)
(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
=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