75×1/4+2点5×2点五的简便运算?
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解:75×1/4+2.5×2.5
=75×2.5+2.5×2.5
=2.5×(75+2.5)
=2.5×77.5
=77.5×10/4
=775/4
=193.75
=75×2.5+2.5×2.5
=2.5×(75+2.5)
=2.5×77.5
=77.5×10/4
=775/4
=193.75
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答:依题意得
75×1/4+2.5×2.5
=75×0.25+2.5×2.5
=7.5×2.5+2.5×2.5
=2.5×(7.5+2.5)
=2.5×10
=25
75×1/4+2.5×2.5
=75×0.25+2.5×2.5
=7.5×2.5+2.5×2.5
=2.5×(7.5+2.5)
=2.5×10
=25
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75×1/4+2.5×2.5
=75×0.25+25×0.25
=0.25×(75+25)
=0.25×100
=25
=75×0.25+25×0.25
=0.25×(75+25)
=0.25×100
=25
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75×1/4+2.5×2
=75×0.25+0.25×20
=0.25×(75+20)
=0.25×95
=0.25×(100-5)
=25-1.25
=23.75
=75×0.25+0.25×20
=0.25×(75+20)
=0.25×95
=0.25×(100-5)
=25-1.25
=23.75
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