Question

递等式计算（要巧算）2.7×4.3+27×0.48+0.27×8

Answer 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×(10 - 0.1)

= 27 - 2.7 = 24.3