2.5ⅹ2.59÷(0.36÷0.8)简便运算?
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=2.5×2.59÷9/20
=2.5×2.59×20/9
=50×2.59/9
=5×25.9/9
=5(26-0.1)/9
=(5×26-5×0.1)/9
=(130-0.5)/9
=129.5/9
=(259/2)/9
=259/18
=2.5×2.59×20/9
=50×2.59/9
=5×25.9/9
=5(26-0.1)/9
=(5×26-5×0.1)/9
=(130-0.5)/9
=129.5/9
=(259/2)/9
=259/18
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