Question

6.5X4.8十5.2X0.45等于多少要简算？

Answer 1

6.5×4.8＋5.2×0.45

＝5×1.3×4.8＋4×1.3×0.45

＝1.3×(5×4.8＋4×0.45)

＝1.3×(24＋1.8)

＝33.54

Answer 2

凡事带5、2的都可以简算，把他们尽量化整。5*2=10
6.5*4.8=13*2.4=26+5.2=31.2
5.2*0.45=2.6*0.9=2.6-0.26=2.34
所以一共是31.2+2.34=33.54
这是心算算法，至于你去约5.2和6.5的公约数13是不合理的，因为4.8与0.45相差一百多倍。

Answer 3

6.5x(5-0.2)十5.2x(0.5-0.05)
=6.5x5-6.5x0.2+5.2ⅹ0.5-5.2x0.05
=32.5-1.3+2.6-0.26
=32.5+(2.6-1.3)-0.26
=32.5+(1.3-0.26)
=32.5+1.04
=33.54