题目内容
| 计算。 | |
| 24.7-11 |
1-0.125÷ |
| 84×0.25+ |
(2.5+3.6)×2 |
| 0.875× |
|
解:①24.7-11
-9
,
=24.7-(11
+9
),
=24.7-20
,
=4
;
②1-0.125÷
,
=1-0.125÷0.125,
=1-1,
=0;
③84×0.25+
×16,
=84×0.25+0.25×16,
=0.25×(84+16),
=0.25×100,
=25;
④(2.5+3.6)×2
+3.9×2
,
=2
×(2.5+3.6+3.9),
=
×10,
=22.5;
⑤0.875×
+0.125÷2,
=0.875×
+0.125×
,
=
×(0.875+0.125),
=
×1,
=
⑥
-30%×0.2÷50%,
=0.5-0.3×0.2÷0.5,
=0.5-0.12,
=0.38
=24.7-(11
=24.7-20
=4
②1-0.125÷
=1-0.125÷0.125,
=1-1,
=0;
③84×0.25+
=84×0.25+0.25×16,
=0.25×(84+16),
=0.25×100,
=25;
④(2.5+3.6)×2
=2
=
=22.5;
⑤0.875×
=0.875×
=
=
=
⑥
=0.5-0.3×0.2÷0.5,
=0.5-0.12,
=0.38
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