解方程.13+x=28.5 2....

解方程.13+x=28.5 2.4x=26.4 4x+13=365 30x+15x=22.5 96÷6+4x=56 3x-2×7=40.
2025-06-28 01:55:17
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回答1:

(1)13+x=28.5,
      13+X-13=28.5-13,
            x=15.5;
(2)2.4x=26.4,
2.4X÷2.4=26.4÷2.4,
        X=11;
(3)4x+13=365,
  4X+13-13=365-13,
        4X=352,
     4X÷4=352÷4,
         X=88;
( 4 ) 30x+15x=22.5,
            45X=22.5,
        45X÷45=22.5÷45
              X=0.5;
(5)96÷6+4x=56,
        16+4X=56,
     16+4X-16=56-16,
           4X=40,
        4X÷4=40÷4
            X=10;
(6)3x-2×7=40,
       3X-14=40,
    3X-14+14=40+14,
          3X=56,
       3X÷3=56÷3,
           X=18

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