(1)15×27-200÷8,
=405-25,
=380;
(2)400-(1300÷65+35),
=400-(20+35),
=400-55,
=345;
(3)7.25-3.42-1.58,
=7.25-(3.42+1.58),
=7.25-5,
=2.25;
(4)283×5+17×5,
=(283+17)×5,
=300×5,
=1500;
(5)8.27+3.7+0.73+6.3,
=(8.27+0.73)+(6.3+3.7),
=9+10,
=19;
(6)25×23×4,
=(25×4)×23,
=100×23,
=2300.