(1)8.35+3.8-2.35,
=8.35-2.35+3.8,
=6+3.8,
=9.8;
(2)15.4-(5.4+2.3),
=15.4-5.4-2.3,
=10-2.3,
=7.7;
(3)98×45,
=(100-2)×45,
=100×45-2×45,
=4500-90,
=4410;
(4)16×125×25,
=(8×125)×(2×25),
=1000×50,
=50000;
(5)12×69-69×2,
=(12-2)×69,
=10×69,
=690;
(6)(20+8)×25,
=20×25+8×25,
=500+200,
=700.