Question

做一道小学数学题。

28.9*61.3+111*6.15用简便方法计算

Answer 1

28.9X61.3+111x6.15
=28.9X61.3+11.1x61.5
=28.9X61.3+11.1x(61.3+0.2)
=28.9x61.3+11.1x61.3+11.1x0.2
=61.3x(28.9+11.1)+2.22
=61.3x40+2.22
=2452+2.22
=2454.22

Answer 2

1771.57+682.65=2454.22

Answer 3

28.9*61.3+111*6.15
=28.9*61.3+（100+11）*6.15
=28.9*61.3+6.15*11+615
=28.9*61.3+61.5*1.1+615
=（28.9+1.1）*61.3+1.1*0.2+615
=30*61.3+0.22+615
=3*613+0.22+615
=1839+615+0.22
=2452.22
虽然写得有点复杂，但是每一步都是仔仔细细的写好了，如果考试的话，这么写可定满分的！！

Answer 4

=289*6.13+111*6.15
=289*6.15+111*6.15-286*0.02
=（289+111）*6.15-289*0.02
=400*6.15-289*0.02
=2460-5.78
=2454.22
我这样写更简洁，看得更清楚！

Answer 5

28.9*61.3+111*6.15
=289×6.13＋111×6.15
=289×（6.15－0.02）＋111×6.15
=289×6.15－289×0.02＋111×6.15
=400×6.15－289×0.02
=2460－5.78
=2454.22