问题
解答题
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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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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.