6.25x55+5.5x37.2的简便算法?
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6.25×55+5.5×37.2
=6.25×55+55×3.72
=55×(6.25+3.72)
=55×9.97
=55×(10-0.03)
=55×10-55×0.03
=550-1.65
=548.35
=6.25×55+55×3.72
=55×(6.25+3.72)
=55×9.97
=55×(10-0.03)
=55×10-55×0.03
=550-1.65
=548.35
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6.25×55+5.5×37.2
=62.5×5.5+5.5×37.2
=(62.5+37.2)×5.5
=99.7×5.5
=(100-0.3)×5.5
=100×5.5-0.3×5.5
=550-1.65
=548.35
=62.5×5.5+5.5×37.2
=(62.5+37.2)×5.5
=99.7×5.5
=(100-0.3)×5.5
=100×5.5-0.3×5.5
=550-1.65
=548.35
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首先我怀疑你题目肯定抄错了,应该是37.5;具体解答如下!
6.25×55+5.5×37.5
=6.25×10×5.5+5.5×37.5
=62.5×5.5+5.5×37.5
=5.5×(62.5+37.5)
=5.5×100
=550
6.25×55+5.5×37.5
=6.25×10×5.5+5.5×37.5
=62.5×5.5+5.5×37.5
=5.5×(62.5+37.5)
=5.5×100
=550
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6.25×55+5.5×37.2
=62.5×5.5+5.5×37.2
=(62.5+37.2)×5.5
=99.7×5.5
=(100-0.3)×5.5
=100×5.5-0.3×5.5
=550-1.65
=548.35
=62.5×5.5+5.5×37.2
=(62.5+37.2)×5.5
=99.7×5.5
=(100-0.3)×5.5
=100×5.5-0.3×5.5
=550-1.65
=548.35
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