考點:分數(shù)的四則混合運算,運算定律與簡便運算,小數(shù)四則混合運算,整數(shù)、分數(shù)、小數(shù)、百分數(shù)四則混合運算
專題:運算順序及法則,運算定律及簡算
分析:(1)先算除法和乘法,再算減法;
(2)根據(jù)加法交換律和結(jié)合律進行簡算;
(3)先算除法,再算減法;
(4)根據(jù)乘法交換律和結(jié)合律進行簡算;
(5)根據(jù)乘法分配律進行簡算;
(6)原式先加上
,再減去
,然后再根據(jù)加法結(jié)合律進行簡算.
解答:
解:(1)360÷15-2.5×1.4
=24-3.5
=20.5;
(2)
-
+
-
=(
+
)-(
+
)
=2-1
=1;
(3)6÷
-
÷6
=10-
=9
;
(4)2.5×(1.9+1.9+1.9+1.9)
=2.5×(1.9×4)
=(2.5×4)×1.9
=10×1.9
=19;
(5)3.64÷4+4.36×25%
=3.64×0.25+4.36×0.25
=(3.64+4.36)×0.25
=8×0.25
=2;
(6)
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點評:考查了運算定律與簡便運算,四則混合運算.注意運算順序和運算法則,靈活運用所學的運算定律簡便計算.