题目内容
(2012?民乐县模拟)计算,能简算的要简算.
95.6×1.8+0.18×44 54.2-
+4.8-
(
+
)×13×29
×
+
×
-
.
95.6×1.8+0.18×44 54.2-
| 2 |
| 9 |
| 16 |
| 9 |
(
| 3 |
| 29 |
| 1 |
| 13 |
| 3 |
| 13 |
| 4 |
| 5 |
| 10 |
| 13 |
| 4 |
| 5 |
| 4 |
| 5 |
分析:(1)95.6×1.8+0.18×44,根据积的变化规律,将原式转化为95.6×1.8+1.8×4.4,再应用乘法分配律进行简算;
(2)54.2-
+4.8-
,根据减法的运算性质,a-b-c=a-(b+c),进行简算;
(3)(
+
)×13×29,应用乘法分配律进行简算;
(4)
×
+
×
-
,应用乘法分配律进行简算.
(2)54.2-
| 2 |
| 9 |
| 16 |
| 9 |
(3)(
| 3 |
| 29 |
| 1 |
| 13 |
(4)
| 3 |
| 13 |
| 4 |
| 5 |
| 10 |
| 13 |
| 4 |
| 5 |
| 4 |
| 5 |
解答:解:(1)95.6×1.8+0.18×44,
=95.6×1.8+1.8×4.4,
=(95.6+4.4)×1.8,
=100×1.8,
=180;
(2)54.2-
+4.8-
,
=54.2+4.8-(
+
),
=59-2,
=57;
(3)(
+
)×13×29,
=(
×13+
×13)×29,
=(
+1)×29,
=
×29+29,
=39+29,
=68;
(4)
×
+
×
-
,
=(
+
-1)×
,
=0×
,
=0.
=95.6×1.8+1.8×4.4,
=(95.6+4.4)×1.8,
=100×1.8,
=180;
(2)54.2-
| 2 |
| 9 |
| 16 |
| 9 |
=54.2+4.8-(
| 2 |
| 9 |
| 16 |
| 9 |
=59-2,
=57;
(3)(
| 3 |
| 29 |
| 1 |
| 13 |
=(
| 3 |
| 29 |
| 1 |
| 13 |
=(
| 39 |
| 29 |
=
| 39 |
| 29 |
=39+29,
=68;
(4)
| 3 |
| 13 |
| 4 |
| 5 |
| 10 |
| 13 |
| 4 |
| 5 |
| 4 |
| 5 |
=(
| 3 |
| 13 |
| 10 |
| 13 |
| 4 |
| 5 |
=0×
| 4 |
| 5 |
=0.
点评:此题考查了应用整数的运算定律和运算性质对小数、分数四则混合运算进行简便计算.
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