Question

136－42简便计算？

Answer 1

用破十法将Ψ2=36十2
原式=136一36-6=100-6≥94

Answer 2

=136-（40+2）=136-40-2=96-2=94即可

Answer 3

136-42
=100+36-42
=100-42+36
=58+36
=94

Answer 4

136-42
=140-4-40-2
=140-40-（4+2）
=100-6
=94

Answer 5

=136-42+8-8
=136+8-42-8
=136+8-(42+8)
=144-50
=94