Question

66.6×9+44.4×11怎么简算？

Answer 1

解：由题可知：
66.6×9+44.4×11
=66.6×9+44.4×9+44.4×2
=（66.6+44.4）×9+88.8
=111×9+88.8
=999+88.8
=1087.8

Answer 2

66.6×9+44.4×11
=66.6×（10-1）+44.4×（10+1）
=666-66.6+444+44.4
=666+444-（66.6-44.4）
=1110-22.2=1087.8

Answer 3

解：
66.6×9+44.4×11
＝9×（66.6+44.4）+44.4×2
＝9×111+88.4
＝999+88.8
＝1087.8
∴66.6×9+44.4×11简便计算等于1087.8

Answer 4

解:66.6×9+44.4×11
=22.2×3×9+22.2×2×11
=22.2×27+22.2×22
=22.2×（27+22）
=22.2×49
=22.2×（50-1）
=22.2×50-22.2
=1110-22.2
=1087.8

Answer 5

66.6×9+44.4×11
=66.6×10-66.6+44.4×10+44.4
=(66.6+44.4)×10+(44.4-66.6)
=111×10-22.2
=1110-22.2
=1087.8