分析:本題先根據(jù)四則混合運算的運算順序計算即可:先算括號中的除法,再算括號中的加法,然后再根據(jù)一個數(shù)減兩個數(shù),等于減去這兩個數(shù)的和減法性質(zhì)計算.
解答:解:42
-(19÷4
+11)-14
=42
-[19×
+11]-14
,
=42
-[4
+11]-14
,
=42
-15
-14
,
=42
-(15
+14
),
=42
-30,
=12
.
點評:完成本題要細心,注意通分、約分.
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