17乘4分之5+1.25乘以(-10)-1又4分之1乘以(-5)

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17乘4分之5+1.25乘以(-10)-1又4分之1乘以(-5)

17乘4分之5+1.25乘以(-10)-1又4分之1乘以(-5)
17乘4分之5+1.25乘以(-10)-1又4分之1乘以(-5)

17乘4分之5+1.25乘以(-10)-1又4分之1乘以(-5)
17 * 5/4 + 1.25 * (-10) - (1+ 1/4) * (-5)
= 17 * 1.25 - 1.25 * (-10) - 1.25 * (-5)
= 1.25 * (17 + 10 + 5)
= 1.25 * 22
= 2.5 * 11
= 27.5

27.5