下面的小动物各代表数字几(1)+27-19=36=______.(2)91-(+18)=47=______.(3)4×7-5==______.(4

2025-04-14 09:54:51
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回答1:

(1)x+27-19=36
            x+8=36
          x+8-8=36-8
              x=28;

(2)91-(x+18)=47
         91-x-18=47
            73-x=47
          73-x+x=47+x
              73=47+x
           73-47=47+x-47
               x=26;

(3)4×7-5=x
         x=28-5
         x=23;

(4)72-(63-x)=29
        72-63+x=29
            9+x=29
          9+x-9=29-9
              x=20.
故答案为:28,26,23,20.