(1.3+3.4+0.72)×(3.4+0.72+6.51)-(1.4+3.4+0.72+6.51)×(3.4+0.72)

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(1.3+3.4+0.72)×(3.4+0.72+6.51)-(1.4+3.4+0.72+6.51)×(3.4+0.72)
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(1.3+3.4+0.72)×(3.4+0.72+6.51)-(1.4+3.4+0.72+6.51)×(3.4+0.72)
(1.3+3.4+0.72)×(3.4+0.72+6.51)-(1.4+3.4+0.72+6.51)×(3.4+0.72)

(1.3+3.4+0.72)×(3.4+0.72+6.51)-(1.4+3.4+0.72+6.51)×(3.4+0.72)
(1.3+3.4+0.72)×(3.4+0.72+6.51)-(1.4+3.4+0.72+6.51)×(3.4+0.72)
=(4.12+1.3)×(4.12+6.51)-(4.12+7.91)×4.12
=4.12×4.12+1.3×4.12+4.12×6.51+1.3×6.51-4.12×4.12-7.91×4.12
=1.3×4.12+1.3×6.51-(7.91-6.51)×4.12
=1.3×4.12+1.3×6.51-1.4×4.12
=1.3×6.51-0.1×4.12
=8.463-0.412
=8.051

8.051

2856

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