脫式計(jì)算(能簡(jiǎn)便的要簡(jiǎn)便).
0.233-(0.133-
5
7
)+
2
7
4.62+9.9+5.38+0.1 4×0.6+0.6÷
1
4
0.38×7-
19
50
+4×
19
50
36×(
4
9
-
5
12
)+15
1
19
+
1
23
)×23×19.
分析:(1)先根據(jù)減法的性質(zhì)去掉括號(hào),再根據(jù)加法結(jié)合律進(jìn)行計(jì)算;
(2)根據(jù)加法交換律和加法結(jié)合律進(jìn)行計(jì)算;
(3)先把除法轉(zhuǎn)化為乘法,再根據(jù)乘法分配律進(jìn)行計(jì)算;
(4)把0.38化成分?jǐn)?shù),再根據(jù)乘法分配律進(jìn)行計(jì)算;
(5)根據(jù)乘法分配律進(jìn)行計(jì)算;
(6)根據(jù)乘法分配律進(jìn)行計(jì)算.
解答:解:(1)0.233-(0.133-
5
7
)+
2
7
,
=0.233-0.133+
5
7
+
2
7
,
=(0.233-0.133)+(
5
7
+
2
7
),
=0.1+1,
=1.1;

(2)4.62+9.9+5.38+0.1,
=(4.62+5.38)+(0.1+9.9),
=10+10,
=20;

(3)4×0.6+0.6÷
1
4
,
=4×0.6+0.6×4,
=0.6×(4+4),
=0.6×8,
=4.8;

(4)0.38×7-
19
50
+4×
19
50

=
19
50
×7-
19
50
+4×
19
50
,
=
19
50
×(7-4+1),
=
19
50
×10,
=
19
5


(5)36×(
4
9
-
5
12
)+15,
=36×
4
9
-36×
5
12
+15,
=16-15+15,
=16;

(6)(
1
19
+
1
23
)×23×19,
=
1
19
×23×19+
1
23
×23×19,
=23+19,
=42.
點(diǎn)評(píng):本題主要考查了學(xué)生在四則運(yùn)算中靈活運(yùn)用簡(jiǎn)便算法的計(jì)算能力.
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