(2-4/5*0.75)/(2+4/5) 递等式计算

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(2-4/5*0.75)/(2+4/5) 递等式计算

(2-4/5×0.75)/(2+4/5)
=(2-4/5×3/4)÷(2+4/5)
=(2-3/5)÷(2+4/5)
=7/5÷14/5
=7/5×5/14
=1/2