问题 解答题
5.3×10.212.5×6.42.6×8.13+2.6×11.87.
答案

①5.3×10.2

=5.3×(10+0.2)

=5.3×10+5.3×0.2

=53+1.06

=54.06;

②12.5×6.4

=12.5×(8×0.8)

=(12.5×8)×0.8

=100×0.8

=80;

③2.6×8.13+2.6×11.87

=2.6×(8.13+11.87)

=2.6×20

=52.

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