计算下列各题.(能简算的要简算)(1)6.65÷(2-1.05)×3.1(2)1.5+4.25×0.8-2.4(3)4.02×[(1-0.

计算下列各题.(能简算的要简算)(1)6.65÷(2-1.05)×3.1(2)1.5+4.25×0.8-2.4(3)4.02×[(1-0.4)÷0.1]+5.4(4)(4.38×5.6-3.38×5.6)×(3.5÷2.5)

第1个回答  2014-08-18
(1)6.65÷(2-1.05)×3.1,
=6.65÷0.95×3.1,
=7×3.1,
=21.7;

(2)1.5+4.25×0.8-2.4,
=1.5+3.4-2.4,
=4.9-2.4,
=2.5;

(3)4.02×[(1-0.4)÷0.1]+5.4,
=4.02×[0.6÷0.1]+5.4,
=4.02×6+5.4,
=24.12+5.4,
=29.52;

(4)(4.38×5.6-3.38×5.6)×(3.5÷2.5),
=[(4.38-3.38)×5.6]×(3.5÷2.5),
=(1×5.6)×(3.5÷2.5),
=5.6×1.4,
=7.84.