负21-12+33+12-67等于多少?

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负21-12+33+12-67等于多少?负21-12+33+12-67等于多少?负21-12+33+12-67等于多少?(-21-12)+33+12-67=(-33+33)+12-67=(0+12)-

负21-12+33+12-67等于多少?
负21-12+33+12-67等于多少?

负21-12+33+12-67等于多少?
(-21-12)+33+12-67
=(-33+33)+12-67
=(0+12)-67
=12-67
-55

付21减12等于付33

负21减去12等于负32加上33等于负1加上12等于11再减去67等于负56

………

-21-12=-33
-33+33=0
0+12=12
12-67=-55

-21-12+33+12-67
=-21+33-67+(12-12)
=12-67
=-55