4x+0.4x=70.4 &nbsp...

4x+0.4x=70.4 3x+90%×4=9 x-40%x=42 120%x-x=24 1-20%x=14 14+20%x=1.
2025-06-26 07:31:04
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回答1:

(1)4x+0.4x=70.4,
           4.4x=70.4,
      4.4x÷4.4=70.4÷4.4,
              x=16;

(2)3x+90%×4=9,
       3x+3.6=9,
   3x+3.6-3.6=9-3.6,
           3x=5.4;
        3÷3x=5.4÷3,
            x=1.8;

(3)x-40%x=42,
      0.6x=42,
 0.6x÷0.6=42÷0.6,
         x=70;

(4)120%x-x=24,
       0.2x=24,
  0.2x÷0.2=24÷0.2,
          x=120;

(5)1-20%x=

1
4

      0.2x=1-0.25,
      0.2x=0.75,
 0.2x÷0.2=0.75÷0.2,
         x=0.375;

   (6)
1
4
+20%x=1.
     0.25+0.2x=1,
0.25+0.2x-0.25=1-0.25;
          0.2x=0.75,
     0.2x÷0.2=0.75÷0.2,
             x=3.75.