题目内容
计算.能简算的要简算,并写出简算过程.
(1)(0.12+0.22+0.32+0.42)2÷(0.13+0.23+0.33+0.43)
(2)3.97÷7+
×4.03-
(3)0.0021×[1
+2.93÷(11
-1.9)]÷0.001
(4)0.125×0.25×0.5×64
(5)4936×(0.75×42.7-0.573×25+57.3)÷3.
(1)(0.12+0.22+0.32+0.42)2÷(0.13+0.23+0.33+0.43)
(2)3.97÷7+
| 1 |
| 7 |
| 1 |
| 7 |
(3)0.0021×[1
| 6 |
| 7 |
| 2 |
| 3 |
(4)0.125×0.25×0.5×64
(5)4936×(0.75×42.7-0.573×25+57.3)÷3.
(1)(0.12+0.22+0.32+0.42)2÷(0.13+0.23+0.33+0.43),
=(0.01+0.04+0.09+0.16)2÷(0.001+0.008+0.027+0.064),
=0.32÷0.1,
=0.09÷0.1,
=0.9;
(2)3.97÷7+
×4.03-
,
=3.97×
+
×4.03-
,
=(3.97+4.03-1)×
,
=7×
,
=1;
(3)0.0021×[1
+2.93÷(11
-1.9)]÷0.001,
=0.0021×[1
+2
÷9
]÷0.001,
=0.0021×[1
+
×
]÷0.001,
=0.0021×[1
+
]÷0.001,
=0.0021×
÷0.001,
=0.00453÷0.001,
=4.53;
(4)0.125×0.25×0.5×64,
=0.125×0.25×0.5×8×4×2,
=(0.125×8)×(0.25×4)×(0.5×2),
=1×1×1,
=1;
(5)4936×(0.75×42.7-0.573×25+57.3)÷3.
=4936×(32.025-14.325+57.3)÷3,
=4936×75÷3,
=370200÷3,
=123400.
=(0.01+0.04+0.09+0.16)2÷(0.001+0.008+0.027+0.064),
=0.32÷0.1,
=0.09÷0.1,
=0.9;
(2)3.97÷7+
| 1 |
| 7 |
| 1 |
| 7 |
=3.97×
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 7 |
=(3.97+4.03-1)×
| 1 |
| 7 |
=7×
| 1 |
| 7 |
=1;
(3)0.0021×[1
| 6 |
| 7 |
| 2 |
| 3 |
=0.0021×[1
| 6 |
| 7 |
| 93 |
| 100 |
| 23 |
| 30 |
=0.0021×[1
| 6 |
| 7 |
| 293 |
| 100 |
| 30 |
| 293 |
=0.0021×[1
| 6 |
| 7 |
| 3 |
| 10 |
=0.0021×
| 151 |
| 70 |
=0.00453÷0.001,
=4.53;
(4)0.125×0.25×0.5×64,
=0.125×0.25×0.5×8×4×2,
=(0.125×8)×(0.25×4)×(0.5×2),
=1×1×1,
=1;
(5)4936×(0.75×42.7-0.573×25+57.3)÷3.
=4936×(32.025-14.325+57.3)÷3,
=4936×75÷3,
=370200÷3,
=123400.
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