Question

7.5*2.13-2.5*2.39简便方法？

Answer 1

7.5×2.13-2.5×2.39
=2.5×6.39-2.5×2.39
=2.5×（6.39-2.39）
=2.5×4
=10，
所以我们可以通过上面的简便计算过程运算进行详细计算，得到答案是10。

Answer 2

7.5×2.13－2.5×2.39
=2.5×3×2.13－2.5×2.39
=2.5×(3×2.13－2.39)
=2.5×4
=10

Answer 3

7.5×2.13-2.5×2.39
=2.5×3×2.13-2.5×2.39
=2.5×6.39-2.5×2.39
=2.5×（6.39-2.39）
=2.5×4
=10.

Answer 4

将7.5分成3×2.5，这样原式=2.5×（3×2.13-2.39），3×2.13=6.39，有了一个.39就能直接减了，得到4×2.5=10

Answer 5

=2.5×3×2.13-2.5×2.39
=（2.31×3-2.39）×2.5
=（6.93-2.39）×2.5
=4.54×2.5
=4.54×5×0.5
=22.7×0.5
=11.35