57.5-4.25-15.75125×3257×16.31-57×2.3199×7980.76×0.25+14×0.24413×0.8+313×80%+45×613.-数学
题文
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答案
(1)57.5-4.25-15.75, =57.5-(4.25+15.75), =57.5-20, =37.5; (2)125×32, =125×(8×4), =125×8×4, =1000×4, =4000; (3)
=
=
=10; (4)99×
=(98+1)×
=98×
=7+
=7
(5)0.76×0.25+
=0.76×0.25+0.25×0.24, =0.25×(0.76+0.24), =0.25×1, =0.25; (6)
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