Question

Tính hợp lí:

(-325). (425-27) - 425. (27-325)

Answer 1

(-325). (425-27) - 425. (27-325) = -2700

Answer 2

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Answer 3

\(\left(-325\right).\left(425-27\right)-425.\left(27-325\right)\)

\(=\text{ }\left[\left(-325\right).425-\left(-325\right).27\right]-\left(425.27-425.325\right)\)

\(=\left(-325\right).425-\left(-325\right).27-425.27+425.325\)

\(=\text{ }\left[\left(-325\right).425+425.325\right]-\text{ }\left[\left(-325\right).27+425.27\right]\)

\(=\text{ }\left\{425.\text{ }\left[\left(-325\right)+325\right]\right\}-\text{ }\left\{27.\text{ }\left[\left(-325+425\right)\right]\right\}\)

\(=\left(425.0\right)-\left(27.100\right)\)

\(=0-2700\)

\(=-2700\)