题目内容
(2011?楚州区模拟)选择合适的方法计算
| 4.96-(1.3+2.96) | 5600÷25÷8 | 1
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|
|
2x-3.57+1.43=10. |
分析:(1)根据连减的性质进行计算;
(2)根据连除的性质进行计算;
(3)根据乘法分配律进行计算;
(4)根据乘法分配律进行计算;
(5)根据等式的性质进行解答;
(6)根据等式的性质进行解答.
(2)根据连除的性质进行计算;
(3)根据乘法分配律进行计算;
(4)根据乘法分配律进行计算;
(5)根据等式的性质进行解答;
(6)根据等式的性质进行解答.
解答:解:
(1)4.96-(1.3+2.96),
=4.96-1.3-2.96,
=4.96-2.96-1.3,
=2-1.3,
=0.7;
(2)5600÷25÷8,
=5600÷(25×8),
=5600÷200,
=28;
(3)1
÷
-
×2
,
=1
×
-
×
,
=(1
-
)×
,
=
×
,
=
;
(4)
×
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(5)
=x:
,
x÷
=
,
x÷
×
=
×
x=
;
(6)2x-3.57+1.43=10,
2x-2.14=10,
2x-2.14+2.14=10+2.14,
2x=12.14,
2x÷2=12.14÷2,
x=6.07.
(1)4.96-(1.3+2.96),
=4.96-1.3-2.96,
=4.96-2.96-1.3,
=2-1.3,
=0.7;
(2)5600÷25÷8,
=5600÷(25×8),
=5600÷200,
=28;
(3)1
| 3 |
| 4 |
| 3 |
| 7 |
| 1 |
| 4 |
| 1 |
| 3 |
=1
| 3 |
| 4 |
| 7 |
| 3 |
| 1 |
| 4 |
| 7 |
| 3 |
=(1
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 3 |
=
| 3 |
| 2 |
| 7 |
| 3 |
=
| 7 |
| 2 |
(4)
| 4 |
| 11 |
| 3 |
| 5 |
| 8 |
| 11 |
| 4 |
| 5 |
=
| 3 |
| 11 |
| 4 |
| 5 |
| 8 |
| 11 |
| 4 |
| 5 |
=(
| 3 |
| 11 |
| 8 |
| 11 |
| 4 |
| 5 |
=1×
| 4 |
| 5 |
=
| 4 |
| 5 |
(5)
| 5 |
| 8 |
| 3 |
| 5 |
x÷
| 3 |
| 5 |
| 5 |
| 8 |
x÷
| 3 |
| 5 |
| 3 |
| 5 |
| 5 |
| 8 |
| 3 |
| 5 |
x=
| 3 |
| 8 |
(6)2x-3.57+1.43=10,
2x-2.14=10,
2x-2.14+2.14=10+2.14,
2x=12.14,
2x÷2=12.14÷2,
x=6.07.
点评:此题主要考查分数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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