题目内容
下面各题,怎样算简便就怎样算.
3.7×
+5.3×0.75+
-
+
-
×
+
÷8
÷[(
+
)×
]5.4×3.6+64×0.54
÷[(
+1.25)×
]-
.
3.7×
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 9 |
| 3 |
| 16 |
| 4 |
| 9 |
| 2 |
| 16 |
| 1 |
| 8 |
| 7 |
| 11 |
| 4 |
| 11 |
| 8 |
| 9 |
| 2 |
| 5 |
| 1 |
| 10 |
| 4 |
| 3 |
| 7 |
| 12 |
| 1 |
| 4 |
| 8 |
| 9 |
| 1 |
| 4 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:①③⑤运用乘法的分配律进行计算即可.
②运用加法的交换律及结合律及一个数连续减去两个数,可以用这个数减去这两个数的和.
④⑥按照四则混合运算的顺序进行计算即可.
②运用加法的交换律及结合律及一个数连续减去两个数,可以用这个数减去这两个数的和.
④⑥按照四则混合运算的顺序进行计算即可.
解答:
解:①3.7×
+5.3×0.75+
=0.75×(3.7+5.3+1)
=0.75×10
=7.5
②
-
+
-
=(
+
)-(
+
)
=1-
=
③
×
+
÷8
=
×
+
×
=
×(
+
)
=
④
÷[(
+
)×
]
=
÷[
×
]
=
×
=
⑤5.4×3.6+64×0.54
=5.4×3.6+6.4×5.4
=5.4×(3.6+6.4)
=5.4×10
=54
⑥
÷[(
+1.25)×
]-
=
÷[
×
]-
=
×
-
=
-
=
| 3 |
| 4 |
| 3 |
| 4 |
=0.75×(3.7+5.3+1)
=0.75×10
=7.5
②
| 5 |
| 9 |
| 3 |
| 16 |
| 4 |
| 9 |
| 2 |
| 16 |
=(
| 5 |
| 9 |
| 4 |
| 9 |
| 2 |
| 16 |
| 3 |
| 16 |
=1-
| 5 |
| 16 |
=
| 11 |
| 16 |
③
| 1 |
| 8 |
| 7 |
| 11 |
| 4 |
| 11 |
=
| 1 |
| 8 |
| 7 |
| 11 |
| 4 |
| 11 |
| 1 |
| 8 |
=
| 1 |
| 8 |
| 7 |
| 11 |
| 4 |
| 11 |
=
| 1 |
| 8 |
④
| 8 |
| 9 |
| 2 |
| 5 |
| 1 |
| 10 |
| 4 |
| 3 |
=
| 8 |
| 9 |
| 1 |
| 2 |
| 4 |
| 3 |
=
| 8 |
| 9 |
| 3 |
| 2 |
=
| 4 |
| 3 |
⑤5.4×3.6+64×0.54
=5.4×3.6+6.4×5.4
=5.4×(3.6+6.4)
=5.4×10
=54
⑥
| 7 |
| 12 |
| 1 |
| 4 |
| 8 |
| 9 |
| 1 |
| 4 |
=
| 7 |
| 12 |
| 3 |
| 2 |
| 8 |
| 9 |
| 1 |
| 4 |
=
| 7 |
| 12 |
| 4 |
| 3 |
| 1 |
| 4 |
=
| 7 |
| 9 |
| 1 |
| 4 |
=
| 19 |
| 36 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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