1.-87.21+53又19/21-12.79+43又2/212.-8.25-(-10)-(-0.25)
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1.-87.21+53又19/21-12.79+43又2/212.-8.25-(-10)-(-0.25)
1.-87.21+53又19/21-12.79+43又2/21
2.
-8.25-(-10)-(-0.25)
1.-87.21+53又19/21-12.79+43又2/212.-8.25-(-10)-(-0.25)
1.-87.21+53又19/21-12.79+43又2/21
=-(87.21+12.79)+(53又19/21+43又2/21)
=-100+97
=-3
2.
-8.25-(-10)-(-0.25)
=-8.25+10+0.25
=2
1, -87.21+53又19/21-12.79+43又2/21
=(53又19/21+43又2/21)-(12.79+87.21)
=97-100
=-3
2,-8.25-(-10)-(-0.25)
=-8.25+0.25+10
=-8+10
=2
1.-87.21+53又19/21-12.79+43又2/21
=(53又19/21+43又2/21)-(87.21+12.79)
=97-100
=-3
2.-8.25-(-10)-(-0.25)
=-8.25+10+0.25
=(-8.25+0.25)+10
2.
-8.25-(-10)-(-0.25)
=-8.25+10+0.25
=2