题目内容
4 |
7 |
1 |
4 |
3 |
7 |
1 |
4 |
1 |
4 |
4 |
7 |
238÷(238+
238 |
239 |
48
3 |
5 |
3 |
10 |
43 |
100 |
分析:(1)(4)运用乘法分配律解答,
(2)运用乘法分配律,以及乘法结合律解答,
(3)先运用乘法分配律化238+
=238×(1+
),再运用除法性质解答.
(2)运用乘法分配律,以及乘法结合律解答,
(3)先运用乘法分配律化238+
238 |
239 |
1 |
239 |
解答:解:(1)
×
+0.25×
-
=
×(
+
-1)
=
×0
=0;
(2)
×(3.73÷1.75+6.27×
)
=(
×
)×(3.73+6.27)
=
×10
=1
;
(3)238÷(238+
)
=238÷[238×(1+
)],
=238÷238÷
=1÷
=
;
(4)48
÷(243×3.75+24
×41.1+2
×214)
=48
÷[24.3×(37.5+41.1+21.4)],
=48
÷[243×100]
=48
÷243
=0.2.
4 |
7 |
1 |
4 |
3 |
7 |
1 |
4 |
=
1 |
4 |
4 |
7 |
3 |
7 |
=
1 |
4 |
=0;
(2)
1 |
4 |
4 |
7 |
=(
1 |
4 |
4 |
7 |
=
1 |
7 |
=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 |
3 |
10 |
43 |
100 |
=48
3 |
5 |
=48
3 |
5 |
=48
3 |
5 |
=0.2.
点评:本题考查知识点:正确选择并运用简便方法解决问题.

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