Question

这道计算题怎么简算？

9.81×0.1+0.5×98.1+0.049×981

Answer 1

原式可变形为：9.81×0.1+5×9.81+9.81×4.9
=9.81×(0.1+5+4.9)
=9.81×10
=98.1

Answer 2

原式=9.81*0.1+9.81*5+9.81*4.9
=9.81*(0.1+4.9+5)
=9.81*10
=98.1

Answer 3

9.81*(0.1+5+4.9)=98.1

Answer 4

9.81×0.1+0.5×98.1+0.049×981
=981×0.001+0.05×981+0.049×981
=981×（0.001+0.05+0.049）
=981×0.1
=98.1

Answer 5

（9.81×0.1+0.5×98.1+0.049×981 ）*1000/1000=(981*1+50*981+49*981)/1000=
981*(1+50+49)/1000=
98.1