简算：19.99乘19.98-19.97乘19.96
人气：425 ℃ 时间：2019-12-21 16:38:18
解答
19.99*19.98-19.97*19.96=(19.97+0.02)*19.98-19.97*(19.98-0.02)=(19.97*19.98+0.02*19.98)-(19.97*19.98-19.97*0.02)=19.97*19.98+0.02*19.98-19.97*19.98+19.97*0.02=0.02*19.98+19.97*0.02=0.02*(19.98+19.97)=0...
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