A . 21.495=21.50,34.465=34.47,6.1305×105=6.131×105B . 8.0130=8.013,1.798501=1.798,0.0028760=0.0029C . 8.0130=8.013,1.798501=1.798,0.0028760=2.876×10-3D . 21.495=21.49,34.465=34.46,6.1305×10^5=6.131×105
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