题目内容
(2012?榆林模拟)
计算(用你喜欢的方法做) 360÷15-2.5×1.6 |
0.4×18+0.4×32 | ||||||||||||||
(1-
|
| ||||||||||||||
|
分析:(1)先算除法和乘法,再算减法;
(2)运用乘法分配律简算;
(3)先算括号内的乘法,再算括号内的减法,最后算括号外的除法;
(4)把除法改为乘法,运用乘法分配律简算;
(5)先算小括号内的,再算中括号内的,最后算括号外的.
(2)运用乘法分配律简算;
(3)先算括号内的乘法,再算括号内的减法,最后算括号外的除法;
(4)把除法改为乘法,运用乘法分配律简算;
(5)先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:(1)360÷15-2.5×1.6,
=24-4,
=10;
(2)0.4×18+0.4×32,
=0.4×(18+32),
=0.4×50,
=20;
(3)(1-
×
)÷
,
=(1-
)÷
,
=
×
,
=
;
(4)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(5)
÷[1-(
+
)],
=
÷[1-
],
=
÷
,
=
×
,
=
.
=24-4,
=10;
(2)0.4×18+0.4×32,
=0.4×(18+32),
=0.4×50,
=20;
(3)(1-
3 |
4 |
2 |
5 |
7 |
8 |
=(1-
3 |
10 |
7 |
8 |
=
7 |
10 |
8 |
7 |
=
4 |
5 |
(4)
7 |
13 |
12 |
17 |
6 |
13 |
17 |
12 |
=
7 |
13 |
12 |
17 |
6 |
13 |
12 |
17 |
=(
7 |
13 |
6 |
13 |
12 |
17 |
=1×
12 |
17 |
=
12 |
17 |
(5)
1 |
2 |
1 |
3 |
4 |
9 |
=
1 |
2 |
7 |
9 |
=
1 |
2 |
2 |
9 |
=
1 |
2 |
9 |
2 |
=
9 |
4 |
点评:考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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