Question

19.98×37+199.8×2.3+9.99×80的简便计算？ (过程也要)

Answer 1

19.98×37+199.8×2.3+9.99×80
=19.98x（37+10x2.3）+9.99x2x40
=19.98x（37+23）+19.98x40
=19.98x60+19.98x40
=19.98x（60+40）
=19.98x100
=1998
谢谢，请采纳

Answer 2

19.98×37+199.8×2.3+9.99×80
=19.98×37+19.98×23+（10-0.01）×80
=19.98×（37+23）+800-0.8
=19.98×60+799.2
=1198.8+799.2
=1998

Answer 3

=19.98×37+19.98×10×2.3+9.99×2×40
=19.98×37+19.98×23+19.98×40
=19.98(37+23+40)
=19.98×100
=1998

Answer 4

19.98×37+199.8×2.3+9.99×80的简便计算？ (过程也要)
=19.98x（37+10x2.3+40）
=19.98x100
=1998