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1.23×2.45-1.22×2.46=1.23×2.45-1.22×（2.45+0.01）=1.23×2.45-1.22×2.45-1.22×0.01=0.01×2.45-1.22×0.01=0.01×（2.45-1.22）=0.01×1.23=0.0123
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1.23×2.45-1.22×2.46
=(1.22+0.01)×2.45-1.22×(2.45+0.01)
=1.22×2.45+0.01×2.45-1.22×2.45-1.22×0.01
=0.01×2.45-1.22×0.01
=0.01×(2.45-1.22)
=0.01×1.23
=0.0123
=(1.22+0.01)×2.45-1.22×(2.45+0.01)
=1.22×2.45+0.01×2.45-1.22×2.45-1.22×0.01
=0.01×2.45-1.22×0.01
=0.01×(2.45-1.22)
=0.01×1.23
=0.0123
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1.23*2.45-1.22*2.46
=1.22×2.45-1.22×2.46+0.01*2.45
=1.22*（2.45-2.46）+0.0245
=0.0245-0.0122
=0.0123
=1.22×2.45-1.22×2.46+0.01*2.45
=1.22*（2.45-2.46）+0.0245
=0.0245-0.0122
=0.0123
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