题目内容
脱式计算我最棒.(能简算的要简算)
×4.5÷(0.75+
)
×[(
+
)÷
]
24×
+51×
(
+
-
)÷
.
1 |
3 |
1 |
4 |
5 |
11 |
2 |
5 |
1 |
3 |
5 |
6 |
24×
51 |
43 |
19 |
43 |
(
5 |
6 |
7 |
8 |
5 |
12 |
1 |
24 |
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)先算加法,再算乘法,最后算除法;
(2)先算加法,再根据乘法结合律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算.
(2)先算加法,再根据乘法结合律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算.
解答:
解:(1)
×4.5÷(0.75+
)
=
×4.5÷1
=1.5÷1
=1.5;
(2)
×[(
+
)÷
]
=
×[
÷
]
=(
×
)÷
=
÷
=
;
(3)24×
+51×
=24×
+19×
=(24+19)×
=43×
=51;
(4)(
+
-
)÷
=(
+
-
)×24
=
×24+
×24-
×24
=20+21-10
=41-10
=31.
1 |
3 |
1 |
4 |
=
1 |
3 |
=1.5÷1
=1.5;
(2)
5 |
11 |
2 |
5 |
1 |
3 |
5 |
6 |
=
5 |
11 |
11 |
15 |
5 |
6 |
=(
5 |
11 |
11 |
15 |
5 |
6 |
=
1 |
3 |
5 |
6 |
=
2 |
5 |
(3)24×
51 |
43 |
19 |
43 |
=24×
51 |
43 |
51 |
43 |
=(24+19)×
51 |
43 |
=43×
51 |
43 |
=51;
(4)(
5 |
6 |
7 |
8 |
5 |
12 |
1 |
24 |
=(
5 |
6 |
7 |
8 |
5 |
12 |
=
5 |
6 |
7 |
8 |
5 |
12 |
=20+21-10
=41-10
=31.
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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