8
9
×
11
12
15
16
×1
1
4
-
15
16
×
1
4
15×(
2
3
+
3
5
)
4
17
×(25×51)
1
3
×
1
2
+
1
2
×
2
3
25
3
4
×4
7
10
×101-
7
10
63
100
×101
7
12
-
1
5
)×60.
分析:(1)依據(jù)分?jǐn)?shù)乘法計(jì)算方法即可解答,
(2)(3)(5)(6)(7)(8)(9)運(yùn)用乘法分配律解答,
(4)運(yùn)用乘法結(jié)合律解答.
解答:解:(1)
8
9
×
11
12
=
22
27


(2)
15
16
×1
1
4
-
15
16
×
1
4
,
=
15
16
×
(1
1
4
-
1
4
),
=
15
16
×
1,
=
15
16
;

(3)15×(
2
3
+
3
5
),
=15×
2
3
+15×
3
5
,
=10+9,
=19;

(4)
4
17
×
(25×51),
=(
4
17
×
51)×25,
=12×25,
=300;

(5)
1
3
×
1
2
+
1
2
×
2
3
,
=
1
2
×
1
3
+
2
3
),
=
1
2
×
1,
=
1
2


(6)25
3
4
×4,
=25×4+
3
4
×
4,
=100+3,
=103;

(7)
7
10
×101-
7
10
,
=
7
10
×
(101-1),
=
7
10
×
100,
=70;

(8)
63
100
×101,
=
63
100
×100+
63
100
×1,
=63+
63
100
,
=63.63;

(9)(
7
12
-
1
5
)×60,
=
7
12
×60-
1
5
×60,
=35-12,
=24.
點(diǎn)評(píng):(1)依據(jù)四則運(yùn)算順序正確進(jìn)行計(jì)算,(2)正確運(yùn)用四則運(yùn)算計(jì)算方法解決問(wèn)題,是本題考查知識(shí)點(diǎn)..
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