递等式计算,能简便的用简便方法计算 4.4+5.6×2.5÷5.6×2.5    (3.8-7.7÷2.5)×2.8 (7.5+7.5+7.5+7.5)×2.5 3.65×62+0.28×365+36.5 (49.5÷7.5+49.5÷2.

问题描述:

递等式计算,能简便的用简便方法计算  

4.4+5.6×2.5÷5.6×2.5               (3.8-7.7÷2.5)×2.8
(7.5+7.5+7.5+7.5)×2.5             3.65×62+0.28×365+36.5
(49.5÷7.5+49.5÷2.5)÷0.01 [3.25-3.25÷(10.3+2.2)]×0.1.

(1)4.4+5.6×2.5÷5.6×2.5
=4.4+(5.6÷5.6)×(2.5×2.5)
=4.4+1×6.25
=4.4+6.25
=10.65;
(2)(3.8-7.7÷2.5)×2.8
=(3.8-3.08)×2.8
=0.72×2.8
=2.016;
(3)(7.5+7.5+7.5+7.5)×2.5
=(7.5×4)×2.5
=7.5×(4×2.5)
=7.5×10
=75;
(4)3.65×62+0.28×365+36.5
=3.65×62+28×3.65+3.65×10
=3.65×(62+28+10)
=3.65×100
=365;
(5)(49.5÷7.5+49.5÷2.5)÷0.01
=(6.6+19.8)÷0.01
=26.4÷0.01
=2640;
(6)[3.25-3.25÷(10.3+2.2)]×0.1
=[3.25-3.25÷12.5]×0.1
=[3.25-0.26]×0.1
=2.99×0.1
=0.299.