(2011?長(zhǎng)汀縣模擬)
用遞等式計(jì)算,能簡(jiǎn)算的要簡(jiǎn)算.
1485+290÷58       
0.125×32×0.25          1080-63.58-36.42
1
3
+
1
4
)×24      
168.1÷(4.3×2-0.4)
5
8
+
1
4
)÷(
2
3
-
1
2
分析:(1)1485+290÷58,根據(jù)整數(shù)四則混合運(yùn)算的運(yùn)算順序,先算除法再算加法;
(2)0.125×32×0.25,把32分解為8×4,再運(yùn)用乘法交換律進(jìn)行簡(jiǎn)算;
(3)1080-63.58-36.42,根據(jù)減法的運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)算;
(4)(
1
3
+
1
4
)×24,運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(5)168.1÷(4.3×2-0.4),根據(jù)小數(shù)四則混合運(yùn)算的運(yùn)算順序,按照小數(shù)四則運(yùn)算的法則進(jìn)行計(jì)算;
(6)(
5
8
+
1
4
)÷(
2
3
-
1
2
),根據(jù)分?jǐn)?shù)四則混合運(yùn)算的運(yùn)算順序,按照分?jǐn)?shù)四則運(yùn)算的法則進(jìn)行簡(jiǎn)算;
解答:解:(1)1485+290÷58,
=1485+5,
=1490;

(2)0.125×32×0.25,
=(0.125×8)×(4×0.25),
=1×1,
=1;

(3)1080-63.58-36.42,
=1080-(63.58+36.42),
=1080-100,
=980;

(4)(
1
3
+
1
4
)×24,
=
1
3
×
24+
1
4
×
24,
=8+6,
=14;

(5)168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5;

(6)(
5
8
+
1
4
)÷(
2
3
-
1
2
),
=
7
8
÷
1
6
,
=
7
8
×
6,
=
21
4
,
=5
1
4
點(diǎn)評(píng):此題主要考查整數(shù)、小數(shù)、分?jǐn)?shù)四則混合運(yùn)算,注意運(yùn)算順序和計(jì)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律、運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)便計(jì)算.
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