=17×1.25-1.25×10+1.25×5
=1.25×(17-10+5)
=1.25×12
=1.25×4×3
=5×3
=15
17乘4分之5+1.25乘(-10)-1又4分之1乘(-5)
17乘4分之5+1.25乘(-10)-1又4分之1乘(-5)
数学人气:640 ℃时间:2020-04-02 12:13:47
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