考點:分數(shù)的四則混合運算,整數(shù)四則混合運算,小數(shù)四則混合運算
專題:運算順序及法則
分析:(1)先算乘法和除法,再算減法;
(2)先算乘法,再根據(jù)減法的性質(zhì)進行簡算;
(3)先算除法,再算減法,最后算乘法;
(4)根據(jù)乘法分配律進行簡算;
(5)先算減法,再算中括號里面的除法,最后算括號外面的除法;
(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)8×35-2448÷24
=280-102
=178;
(2)3-
×
-
=3-
-
=3-(
+
)
=3-1
=2;
(3)(0.63-0.63÷3)×0.5
=(0.63-0.21)×0.5
=0.42×0.5
=0.21;
(4)3.64÷4+4.36×0.25
=3.64×0.25+4.36×0.25
=(3.64+4.36)×0.25
=8×0.25
=2;
(5)
÷[
÷(
-
)]
=
÷[
÷
]
=
÷
=
;
(6)
+
+
+
=
+
+
+
+
-
=
+
+
+(
+
)-
=
+
+
+
-
=
+
+(
+
)-
=
+
+
-
=
+(
+
)-
=
+
-
=1-
=
.
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.