题目内容
计算:
| 8.06-2.73-5.27 | 1.25+
|
|
X-0.75X=0.375. |
分析:(1)根据连减的性质进行计算;
(2)根据加法交换律和结合律进行计算;
(3)根据乘法分配律进行计算;
(4)根据等式的性质进行解方程即可.
(2)根据加法交换律和结合律进行计算;
(3)根据乘法分配律进行计算;
(4)根据等式的性质进行解方程即可.
解答:解:(1)8.06-2.73-5.27,
=8.06-(2.73+5.27),
=8.06-8,
=0.06;
(2)1.25+
+0.75+
,
=(1.25+0.75)+(
+
),
=2+1,
=3;
(3)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)X-0.75X=0.375,
0.25X=0.375,
0.25X÷0.25=0.375÷0.25,
X=1.5.
=8.06-(2.73+5.27),
=8.06-8,
=0.06;
(2)1.25+
| 4 |
| 5 |
| 1 |
| 5 |
=(1.25+0.75)+(
| 4 |
| 5 |
| 1 |
| 5 |
=2+1,
=3;
(3)
| 5 |
| 11 |
| 6 |
| 7 |
| 6 |
| 11 |
| 7 |
| 6 |
=
| 5 |
| 11 |
| 7 |
| 6 |
| 6 |
| 11 |
| 7 |
| 6 |
=(
| 5 |
| 11 |
| 6 |
| 11 |
| 7 |
| 6 |
=1×
| 7 |
| 6 |
=
| 7 |
| 6 |
(4)X-0.75X=0.375,
0.25X=0.375,
0.25X÷0.25=0.375÷0.25,
X=1.5.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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计算:
| 8.06-2.73-5.27 | 1.25+ | X-0.75X=0.375. |