4141 3
2 1 4
分析:(1)41×101,運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(2)
÷(
+
)×15,根據(jù)分?jǐn)?shù)四則混合運(yùn)算的順序,按照分?jǐn)?shù)四則運(yùn)算的計(jì)算法則進(jìn)行計(jì)算;
(3)
+
+
+
,運(yùn)用加法交換律和結(jié)合律進(jìn)行簡(jiǎn)算;
(4)12×(
+
-
),運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(5)4×
+4×
,運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(6)
×(
+
),按照分?jǐn)?shù)四則混合運(yùn)算的順序進(jìn)行計(jì)算.
解答:(1)41×101,
=41×100+41,
=4100+41,
=4141;
(2)
÷(
+
)×15,
=
15,
=
15
=
,
=3
;
(3)
+
+
+
,
=(
)+(
),
=1+1,
=2;
(4)12×(
+
-
),
=12×
12×
12×
,
=3+2-4,
=1;
(5)4×
+4×
,
=4×(
),
=4×1,
=4;
(6)
×(
+
),
=
,
=
.
點(diǎn)評(píng):此題考查的目的是使學(xué)生靈活運(yùn)用加法、乘法的運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.