49-(-20.6)-3/5 (-21.6)+3-7.4+(-2/5)

月儿弯弯照九州2022-10-04 11:39:540条回答

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1.49-(-20.6)-3/5 2.31+(-5/4)+0.25 3.(-6/5)-7-(-3.2)+(-1)
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1.49-(-20.6)-3/5
=49+(20.6-3/5)
=49+20
=69
2.31+(-5/4)+0.25
=31+(-5/4+0.25)
=31-1
=30
3.(-6/5)-7-(-3.2)+(-1)
=(-6/5+3.2)-(7+1)
=2-8
=-6