36×2.57+1.2×22.9的简便方法?
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36x2.57+1.2x22.9
=3×12X2.57+12X2.29
=12X7.71+12X2.29
=12x(7.71+2.29)
=12X10
=120
=3×12X2.57+12X2.29
=12X7.71+12X2.29
=12x(7.71+2.29)
=12X10
=120
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展开全部
36x2.57+1.2x22.9
=12x3x2.57+12x2.29
=12x7.71+12x2.29
=12x(7.71+2.29)
=12x10
=120
=12x3x2.57+12x2.29
=12x7.71+12x2.29
=12x(7.71+2.29)
=12x10
=120
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评论
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