Question

4.44×9.8×2.5怎么简便计算？

Answer 1

4.44×9.8×2.5
＝1.11×4×9.8×2.5
＝1.11×（4×2.5）×9.8
＝1.11×10×9.8
＝11.1×9.8
＝（11+0.1）×（10-0.2）
＝11×10-11×0.2+0.1×10-0.1×0.2
＝110-2.2+1-0.02
＝110-（2.2-1+0.02）
＝110-1.22
＝108.78

Answer 2

4.44×9.8×2.5
= 4×1.11×（10-0.2）×2.5
= 1.11×（10-0.2）×2.5×4
=[ 1.11×10-1.11×0.2]× （ 2.5×4 ）
=（ 11.1-0.222）× 10
= 11.1× 10-0.222× 10
= 111-2.22
= 108.78

Answer 3

4.44×9.8×2.5
＝1.11×(10-0.2)×4×2.5
＝(1.11×10-1.11×0.2)×10
＝(11.1-0.222)×10
＝11.1×10-0.222×10
＝111-2.22
＝2.22-2.22+108.78
＝108.78

Answer 4

4.44×9.8×2.5
=4×1.11×9.8×2.5
=（4×2.5）×1.11×（10－0.2）
=10×1.11×（10－0.2）
=11.1×（10－0.2）
=11.1×10－11.1×0.2
=111－2.22
=108.78

Answer 5

4.44××9.8×2.5
=4.44×2.5×9.8
=(4+0.44)×2.5×9.8
=（4×2.5+0.44×2.5）×9.8
=(10+1.1)×9.8
=10×9.8+1.1×9.8
=98+10.78
=108.78