18÷{1-{0.4+(1-0.4)}*0.4= 1÷(6/1-3/1)*6/1= -3-{4-(4-3.5*3/1)}*{-2+(-3)}=急

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18÷{1-{0.4+(1-0.4)}*0.4= 1÷(6/1-3/1)*6/1= -3-{4-(4-3.5*3/1)}*{-2+(-3)}=

1.=18/0.76=1800/76=450/19=437又13/19
2.=-1
3.-3-(10.5*(-5))=49.5