①23.1-（12.1-2.46 ）

=23.1-12.1+2.46

=11+2.46

=13.46

②14.35+3.98+2.65

=（14.35+2.65）+3.98

=17+3.98

=20.98

③12.5-8.14-1.86

=12.5-（8.14+1.86）

=12.5-10

=2.5

④125×56

=125×8×7

=1000×7

=7000

⑤56×75+44×75

=75×（56+44）

=75×100

=7500

⑥101×43-43

=（101-1）×43

=100×43

=4300