2点5加37点8加74 乘3点78加3点78怎么用简便运算?
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(2.5+37.8)应该是(2.5×37.8)吧?这样才能很好的简便运算。
2.5+37.8+74×3.78+3.78
=2.5+3.78×10+74×3.78+3.78
=2.5+3.78×(10+74+1)
=2.5+3.78×85
=2.5+3.78×(80+5)
=2.5+302.4+18.9
=323.8
2.5×37.8+74×3.78+3.78
=25×3.78+74×3.78+3.78
=(25+74+1)×3.78
=100×3.78
=378
2.5+37.8+74×3.78+3.78
=2.5+3.78×10+74×3.78+3.78
=2.5+3.78×(10+74+1)
=2.5+3.78×85
=2.5+3.78×(80+5)
=2.5+302.4+18.9
=323.8
2.5×37.8+74×3.78+3.78
=25×3.78+74×3.78+3.78
=(25+74+1)×3.78
=100×3.78
=378
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