0.98 x 2.01=(1-0.02)x2.01
=2.01-0.02x2.01
=2.01-0.0402
=1.9698
原式=0.98×（2+0.01）
=0.98×2+0.98×0.01
=1.96+0.0098
=1.9698
0.98*(2+0.01)
=0.98*2+0.98*0.01
=1.96+0.0098
=1.9698
=(1-0.02)×2.01
=2.01-0.02×2.01
=2.01-0.0402
=1.9698
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