Question

15.5+24.5×8.6用简便计算？

Answer 1

15.5+24.5×8.6
=15.5+24.5×(10-1-0.4)
=15.5+245-24.5-9.8
=260.5-34.3
=226.2

Answer 2

回答：
15.5+24.5×8.6
=15.5+24.5×2×4.3
=15.5+49×4.3
=15.5+（50-1）×4.3
=15.5+50×4.3-4.3
=（15.5-4.3）+50×4.3
=11.2+215
=226.2
运用了乘法分配律

Answer 3

15.5+24.5x8.6
=15.5+24.5（8+0.6）
=15.5+196+14.7
=226.2

Answer 4

原式等于15.5+（25-0.5）×8.6
=15.5+25×8.6-0.5×8.6
=15.5+215-4.3
=15.5-4.3+215
=11.2+215=226.2

Answer 5

15.5+24.5*8.6=3.1*5+4.9*5*8.6=
5*(3.1+4.9*8.6)=5*(8+7.6)=
5*15.6=78