Question

99Ⅹ127十99的简便算法？

Answer 1

99×127+99＝99×（127+1）＝99×128=12672

Answer 2

99×127+99
=99X127+99×1
=99X（127+1）
=99×128
=（100-1）×128
=100×128-128
=12800-128
=12672

Answer 3

=127×100+99－127
=12799－127
=12672

Answer 4

99*127+99
=99*128
=12800-128
=12672

Answer 5

=127×(99+1)
=127×100
+12700