（1+3.78+4.56）×（3.78+4.56+0.2)-(1+3.78+4.56+0.2)×(3.78+4.56)

（1+3.78+4.56）×（3.78+4.56+0.2)-(1+3.78+4.56+0.2)×(3.78+4.56)
（1+3.78+4.56）×（3.78+4.56+0.2)-(1+3.78+4.56+0.2)×(3.78+4.56)

（1+3.78+4.56）×（3.78+4.56+0.2)-(1+3.78+4.56+0.2)×(3.78+4.56)
设m=1+3.78+4.56
原式=m*(m-1+0.2)-(m+0.2)*(m-1)
=m*m-m+0.2m-m*m-0.2m+m+0.2
=0.2

原式=（1+3.78+4.56）×（3.78+4.56+0.2)-(1+3.78+4.56+0.2)×(3.78+4.56)
=（1+3.78+4.56）×（3.78+4.56)+（1+3.78+4.56）×0.2-(1+3.78+4.56)×(3.78+4.56)-0.2×(3.78+4.56)
=（1+3.78+4.56）...

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原式=（1+3.78+4.56）×（3.78+4.56+0.2)-(1+3.78+4.56+0.2)×(3.78+4.56)
=（1+3.78+4.56）×（3.78+4.56)+（1+3.78+4.56）×0.2-(1+3.78+4.56)×(3.78+4.56)-0.2×(3.78+4.56)
=（1+3.78+4.56）×0.2-0.2×(3.78+4.56)
=【（1+3.78+4.56）-(3.78+4.56)】×0.2
=1×0.2
=0.2

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