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3题:=-1.5+4.25+2.75+(-5.5) -(-3)方×2
=-1.5-5.5+4.25+2.75 =-9×2
=-7+7 =-18
=0
4题:=40-63
=-23
5题:=4-5×(-1/8)
=4-(-5/8)
=4+5/8
=4又8分之5
6题:=(-0.4)-5/6+4.9-0.6
=(-0.4)-0.6+4.9-5/6
=(-1)+4.9-5/6
=3.9-5/6
=39/10-5/6
=117/30-25/30
=92/30
=46/15
=3又15分之1
7题:=100÷5×(-2/5)
=20×(-2/5)
=-8
8题:=-125×9/25
=-45
=-1.5-5.5+4.25+2.75 =-9×2
=-7+7 =-18
=0
4题:=40-63
=-23
5题:=4-5×(-1/8)
=4-(-5/8)
=4+5/8
=4又8分之5
6题:=(-0.4)-5/6+4.9-0.6
=(-0.4)-0.6+4.9-5/6
=(-1)+4.9-5/6
=3.9-5/6
=39/10-5/6
=117/30-25/30
=92/30
=46/15
=3又15分之1
7题:=100÷5×(-2/5)
=20×(-2/5)
=-8
8题:=-125×9/25
=-45
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