4
7
×
1
4
+0.25×
3
7
-
1
4

1
4
×(3.73÷1.75+6.27×
4
7

238÷(238+
238
239

48
3
5
÷(243×3.75+24
3
10
×41.1+2
43
100
×214)
分析:(1)(4)運(yùn)用乘法分配律解答,
(2)運(yùn)用乘法分配律,以及乘法結(jié)合律解答,
(3)先運(yùn)用乘法分配律化238+
238
239
=238×(1+
1
239
),再運(yùn)用除法性質(zhì)解答.
解答:解:(1)
4
7
×
1
4
+0.25×
3
7
-
1
4

=
1
4
×
4
7
+
3
7
-1)
=
1
4
×
0
=0;

(2)
1
4
×(3.73÷1.75+6.27×
4
7

=(
1
4
×
4
7
)×(3.73+6.27)
=
1
7
×10
=1
3
7
;

(3)238÷(238+
238
239

=238÷[238×(1+
1
239
)],
=238÷238÷
240
239

=1÷
240
239

=
239
240


(4)48
3
5
÷(243×3.75+24
3
10
×41.1+2
43
100
×214)
=48
3
5
÷[24.3×(37.5+41.1+21.4)],
=48
3
5
÷[243×100]
=48
3
5
÷243
=0.2.
點(diǎn)評(píng):本題考查知識(shí)點(diǎn):正確選擇并運(yùn)用簡(jiǎn)便方法解決問(wèn)題.
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