题目内容
正确、灵活地计算:
①3.2×〔3.25-6÷(1.25+
)〕
②
÷4+
×
③1.25×
×8×27
④1.9-1.9×(1.9-1.9)
①3.2×〔3.25-6÷(1.25+
| 1 |
| 4 |
②
| 6 |
| 11 |
| 1 |
| 4 |
| 10 |
| 11 |
③1.25×
| 7 |
| 9 |
④1.9-1.9×(1.9-1.9)
①3.2×[3.25-6÷(1.25+
)],
=3.2×[3.25-6÷1.5],
=3.2×(3.25-4)
=3.2×(-0.75),
=-2.4;
②
÷4+
×
,
=
×
+
×
,
=
×(
+
),
=
×
,
=
;
③1.25×
×8×27,
=(1.25×8)×(
×27),
=10×21,
=210;
④1.9-1.9×(1.9-1.9),
=1.9-1.9×0,
=1.9-0,
=1.9.
| 1 |
| 4 |
=3.2×[3.25-6÷1.5],
=3.2×(3.25-4)
=3.2×(-0.75),
=-2.4;
②
| 6 |
| 11 |
| 1 |
| 4 |
| 10 |
| 11 |
=
| 6 |
| 11 |
| 1 |
| 4 |
| 1 |
| 4 |
| 10 |
| 11 |
=
| 1 |
| 4 |
| 6 |
| 11 |
| 10 |
| 11 |
=
| 1 |
| 4 |
| 16 |
| 11 |
=
| 4 |
| 11 |
③1.25×
| 7 |
| 9 |
=(1.25×8)×(
| 7 |
| 9 |
=10×21,
=210;
④1.9-1.9×(1.9-1.9),
=1.9-1.9×0,
=1.9-0,
=1.9.
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