题目内容
样算简便就怎样算
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24×7×(
|
|
分析:(1)根据乘法分配律进行简算;
(2)先算减法,再算乘法,最后算除法;
(3)根据乘法分配律进行简算;
(4)先算除法,再算乘法.
(2)先算减法,再算乘法,最后算除法;
(3)根据乘法分配律进行简算;
(4)先算除法,再算乘法.
解答:解:(1)
×
+
÷6
=
×
+
×
=(
+
)×
=1×
=
;
(2)
÷[
×(
-
)]
=
÷[
×
]
=
÷
=
;
(3)24×7×(
+
)
=24×7×
+24×7×
=120+98
=218;
(4)
÷0.6×
=
×
=
.
7 |
10 |
1 |
6 |
3 |
10 |
=
7 |
10 |
1 |
6 |
3 |
10 |
1 |
6 |
=(
7 |
10 |
3 |
10 |
1 |
6 |
=1×
1 |
6 |
=
1 |
6 |
(2)
9 |
32 |
4 |
3 |
7 |
16 |
1 |
4 |
=
9 |
32 |
4 |
3 |
3 |
16 |
=
9 |
32 |
1 |
4 |
=
9 |
8 |
(3)24×7×(
5 |
7 |
7 |
12 |
=24×7×
5 |
7 |
7 |
12 |
=120+98
=218;
(4)
18 |
35 |
2 |
3 |
=
6 |
7 |
2 |
3 |
=
4 |
7 |
点评:考查了运算定律与简便运算,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简便计算.
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