解方程.78x+4=82 100÷100x=10 x-49+16=56 9x-10-8x=10 5×8.5-10x=17.5 (y+8)÷0.25=100 3x+

解方程.78x+4=82 100÷100x=10 x-49+16=56 9x-10-8x=10 5×8.5-10x=17.5 (y+8)÷0.25=100 3x+24=5x+23 (y+3.5)×8=10y.

(1)78x+4=82,
       78x+4-4=82-4,
           78x=78,
       78x÷78=78÷78,
             x=1;

(2)100÷100x=10,
100÷100x×100x=10×100x,
            100=1000x,
      100÷1000=1000x÷1000,
              x=0.1;

(3)x-
4
9
+
1
6
=
5
6

       x-
5
18
=
5
6

   x-
5
18
+
5
18
=
5
6
+
5
18

            x=1
1
9


(4)9x-10-8x=10,
         x-10=10,
      x-10+10=10+10,
            x=20;

(5)5×8.5-10x=17.5,
   42.5-10x+10x=17.5+10x,
      42.5-17.5=17.5+10x-17.5,
             25=10x,
         25÷10=10x÷10,
              x=2.5;

(6)(y+8)÷0.25=100,
(y+8)÷0.25×0.25=100×0.25,
              y+8-8=25-8,
                  y=17;

(7)3x+24=5x+23,
  3x+24-3x=5x+23-3x,
     24-23=2x+23-23,
         1=2x,
      1÷2=2x÷2,
         x=0.5;

(8)(y+3.5)×8=10y,
         8y+28-8y=10y-8y,
               28=2y,
            28÷2=2y÷2,
                y=14.
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第1个回答  2022-05-20
三x+24=5 x+23解方程
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