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负二减负五加负九减负七

(-2)-(-5)+(-9)-(-7) =-2+5-9+7 =3-9+7 =1

-15 2 -4 -10

3+15/37-9.5-2-10/37-5/37-10.5 =3-9.5-10.5+(15/37-

减三又七分? 是不是出错了 ?

4.7-(-8.9)-7.5+(-6)=4.7+8.9-7.5-6=0.1

负的9分之76

-4.9-91-(-5)+(-9)=-95.9+5-9=100.9-9=91.9

等于 零

总共等于0

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