题目内容
计算下面各题.(能简便的要简便)
×
×
(13+
)×
×87
11×
×
+
×
125×
×
10-3
-0.25
(33+
)×3.
| 4 |
| 7 |
| 1 |
| 3 |
| 7 |
| 36 |
(13+
| 2 |
| 3 |
| 3 |
| 26 |
| 3 |
| 86 |
11×
| 3 |
| 4 |
| 1 |
| 36 |
| 8 |
| 9 |
| 1 |
| 2 |
| 5 |
| 9 |
125×
| 2 |
| 23 |
| 1 |
| 5 |
10-3
| 3 |
| 4 |
(33+
| 1 |
| 15 |
分析:(1)(4)按照从左到右顺序解答,
(2)(3)(8)运用乘法分配律解答,
(5)按照先算乘法,再算加法顺序解答,
(6)运用乘法交换律解答,以及乘法分配律解答,
(7)运用减法性质解答.
(2)(3)(8)运用乘法分配律解答,
(5)按照先算乘法,再算加法顺序解答,
(6)运用乘法交换律解答,以及乘法分配律解答,
(7)运用减法性质解答.
解答:解:(1)
×
×
=
×
=
;
(2)(13+
)×
=13×
+
×
=
+
=1
;
(3)
×87
=
×86+
×1
=3+
=3
;
(4)11×
×
=
×
=
;
(5)
+
×
=
+
=1
;
(6)125×
×
=125×
×
=25×
=23×
+2×
=2+
=2
;
(7)10-3
-0.25
=10-(3
+0.25)
=10-4
=6;
(8)(33+
)×3
=33×3+
×3
=99+
=99
.
| 4 |
| 7 |
| 1 |
| 3 |
| 7 |
| 36 |
=
| 4 |
| 21 |
| 7 |
| 36 |
=
| 1 |
| 27 |
(2)(13+
| 2 |
| 3 |
| 3 |
| 26 |
=13×
| 3 |
| 26 |
| 2 |
| 3 |
| 3 |
| 26 |
=
| 3 |
| 2 |
| 1 |
| 13 |
=1
| 15 |
| 26 |
(3)
| 3 |
| 86 |
=
| 3 |
| 86 |
| 3 |
| 86 |
=3+
| 3 |
| 86 |
=3
| 3 |
| 86 |
(4)11×
| 3 |
| 4 |
| 1 |
| 36 |
=
| 33 |
| 4 |
| 1 |
| 36 |
=
| 11 |
| 48 |
(5)
| 8 |
| 9 |
| 1 |
| 2 |
| 5 |
| 9 |
=
| 8 |
| 9 |
| 5 |
| 18 |
=1
| 1 |
| 6 |
(6)125×
| 2 |
| 23 |
| 1 |
| 5 |
=125×
| 1 |
| 5 |
| 2 |
| 23 |
=25×
| 2 |
| 23 |
=23×
| 2 |
| 23 |
| 2 |
| 23 |
=2+
| 4 |
| 23 |
=2
| 4 |
| 23 |
(7)10-3
| 3 |
| 4 |
=10-(3
| 3 |
| 4 |
=10-4
=6;
(8)(33+
| 1 |
| 15 |
=33×3+
| 1 |
| 15 |
=99+
| 1 |
| 5 |
=99
| 1 |
| 5 |
点评:本题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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