分析:(1)把64化成8×8進行簡算即可,
(2)先算除法,再從左向右進行計算,
(3)運用乘法的分配律進行簡算,
(4)運用乘法的分配律進行簡算,
(5)運用加減法的性質(zhì)進行簡算,
(6)運用加減法的性質(zhì)進行簡算,
(7)運用乘法的分配律進行簡算,
(8)運用乘法的分配律進行簡算,
(9)運用乘法的運算定律進行簡算.
解答:解:(1)64×125÷8,
=8×8×125÷8,
=(8×125)×8÷8,
=1000×8÷8,
=1000;
(2)18.7-2.8-12.9÷1.8,
=18.7-2.8-
,
=15.9-
,
=
;
(3)3
×3.7+3.6+5.3×3
,
=3
×(3.7+1+5.3),
=3
×10,
=36;
(4)9
×4.25+4
×
-4
×2,
=(9
+
-2)×4
,
=8×4.25,
=34;
(5)7.25-3
+3.75-6
,
=(7.25+3.75)-(3
+6
),
=11-10,
=1;
(6)105.4-4.73+14
-15.27,
=(105.4+14
)-(4.73+15.27),
=120-20,
=100;
(7)(
+
-
)×4×9,
=
×4×9+
×4×9-
×4×9,
=6+4-3,
=10-3,
=7;
(8)7342×11
+265.8×112.5,
=7342×11.25+265.8×112.5,
=734.2×112.5+265.8×112.5,
=(734.2+265.8)×112.5,
=1000×112.5,
=112500;
(9)0.9+99×0.9+1.9×4×0.5,
=(1+99)×0.9+1.9×(4×0.5),
=100×0.9+1.9×2,
=90+3.8,
=93.8.
點評:本題主要考查了學(xué)生在四則混合運算中靈活運用運算定律進行簡便算法的計算能力.