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第1个回答 2020-05-04
0.8×6.25-4.4×0.25
=0.8×(6+0.25)-(4+0.4)×0.25
=(0.8×6+0.8×0.25)-(4×0.25+0.4×0.25)
=[4.8+0.2×(4×0.25)]-(1+0.1)
=(4.8+0.2×1)-1.1
=4.8+0.2-1.1
=5-1.1
=3.9
=0.8×(6+0.25)-(4+0.4)×0.25
=(0.8×6+0.8×0.25)-(4×0.25+0.4×0.25)
=[4.8+0.2×(4×0.25)]-(1+0.1)
=(4.8+0.2×1)-1.1
=4.8+0.2-1.1
=5-1.1
=3.9