29.94-(19.94+12.8)+2.8用简便计算尽快

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29.94-(19.94+12.8)+2.8用简便计算尽快
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29.94-(19.94+12.8)+2.8用简便计算尽快
29.94-(19.94+12.8)+2.8用简便计算
尽快

29.94-(19.94+12.8)+2.8用简便计算尽快
29.94-(19.94+12.8)+2.8
=29.94-19.94-12.8+2.8
=(29.94-19.94)-(12.8-2.8)
=0

29.94-(19.94+12.8)+2.8
=29.94-19.94-12.8+2.8
=(29.94-19.94)-(12.8-2.8)
=10-10
=0

(29.94-19.94)+(-12.8+2.8)= 0

(29.94-19.94)-(12.8+0.2)+(2.8+0.2)
10-13+3
0

=(29.94-19.94)-(12.8-2.8)=10-10=0