-3-[-5+(1-2×3/5)÷(-2)]写清过程

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-3-[-5+(1-2×3/5)÷(-2)]写清过程
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-3-[-5+(1-2×3/5)÷(-2)]写清过程
-3-[-5+(1-2×3/5)÷(-2)]写清过程

-3-[-5+(1-2×3/5)÷(-2)]写清过程
-3-[-5+(1-2×3/5)÷(-2)]
=-3-[-5+(-1/5)×(-1/2)]
=-3-(-5+1/10)
=-3+5-1/10
=19/10

X*(1-2/3)+(24-X)*(1-3/5)=8.6 x-2/3x+48/5-2/5x=8.6 1=1/15x x=15

-3-[-5+(1-2×3/5)÷(-2)]
=-3-[-5+(1-6/5)÷(-2)]
=-3-[-5+(-1/5)÷(-2)]
=-3-[-5+1/10]
=-3+49/10
=49-30/10
=19/10