问题
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计算1/4+3/8+7/16+15/32+31/64+63/128+127/256+255/512+511/1024=? A.3×(513/1024)B
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3,3,29,15,127,35,()A.345B.360C.256 D.290
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3,3,29,15,127,35,()A.345B.360 C.256D.290
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-3,3,25,127,341,()A.627B.717C.731 D.1022
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-3,3,25,127,341,() A.627 B.717 C.731 D.1022
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用简便方法计算,写出简算过程(1)2.5×3.2×1.25(2)4.05-(2.05+527)(3)5.39+127+4.61+57(4)0.588×123+4×9.412+