5.5×7.5-0.55×7.5的简便运算？
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5.5×7.5-0.55×7.5
=5.5×7.5 - 0.55 x(10 x 0.75)
=5.5x7.5 -0.55x10x0.75
=5.5x7.5 -5.5x0.75
=5.5x(7.5-0.75)
=5.5 x 6.75
=(5+0.5) x 6.75
=5x6.75 +0.5 x6.75
=33.75 + 3.375
=37.125
=5.5×7.5 - 0.55 x(10 x 0.75)
=5.5x7.5 -0.55x10x0.75
=5.5x7.5 -5.5x0.75
=5.5x(7.5-0.75)
=5.5 x 6.75
=(5+0.5) x 6.75
=5x6.75 +0.5 x6.75
=33.75 + 3.375
=37.125
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