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用递等式计算.(写出必要的计算过程,能简便的用简便方法计算)(9.4-5.8)×2.0712.54-4.56-3.44-1.54(9.36×5+9.36+9.36×2)×1.257.236÷0.18-14.3×0.02.
题目详情
用递等式计算.(写出必要的计算过程,能简便的用简便方法计算)
(9.4-5.8)×2.07 | 12.54-4.56-3.44-1.54 |
(9.36×5+9.36+9.36×2)×1.25 | 7.236÷0.18-14.3×0.02. |
▼优质解答
答案和解析
①(9.4-5.8)×2.07,
=3.6×2.07,
=7.452;
②12.54-4.56-3.44-1.54,
=(12.54-1.54)-(4.56+3.44),
=11-8,
=3;
③(9.36×5+9.36+9.36×2)×1.25,
=9.36×(5+2+1)×1.25,
=9.36×8×1.25,
=9.36×(8×1.25),
=93.6;
④7.236÷0.18-14.3×0.02,
=40.2-0.286,
=39.914.
=3.6×2.07,
=7.452;
②12.54-4.56-3.44-1.54,
=(12.54-1.54)-(4.56+3.44),
=11-8,
=3;
③(9.36×5+9.36+9.36×2)×1.25,
=9.36×(5+2+1)×1.25,
=9.36×8×1.25,
=9.36×(8×1.25),
=93.6;
④7.236÷0.18-14.3×0.02,
=40.2-0.286,
=39.914.
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