(1)30÷15+15×30
=2+450
=452;
(2)201×35
=(200+1)×35
=200×35+1×35
=7000+35
=7035;
(3)7×(4×3)×25
=(7×3)×(4×25)
=21×100
=2100;
(4)125×48
=125×(8×6)
=125×8×6
=1000×6
=6000;
(5)(270+35×6)÷80
=(270+210)÷80
=480÷80
=6;
(6)88×13-13×68
=(88-68)×13
=20×13
=260.
(1)30÷15+15×30
=2+450
=452;
(2)201×35
=(200+1)×35
=200×35+1×35
=7000+35
=7035;
(3)7×(4×3)×25
=(7×3)×(4×25)
=21×100
=2100;
(4)125×48
=125×(8×6)
=125×8×6
=1000×6
=6000;
(5)(270+35×6)÷80
=(270+210)÷80
=480÷80
=6;
(6)88×13-13×68
=(88-68)×13
=20×13
=260.