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解方程.(1)7x+4-46(2)9x-15=57(3)96+12x=144(4)3.2x-9.8=9.4(5)x+4.6×3=16.9(6)7×5-5x=33.5(7)x-0.64=36(8)4(2x一0.8x)=16.8(9)3.6x+2.4x-3.6=0.

题目详情
解方程.
(1)7x+4-46    
(2)9x-15=57
(3)96+12x=144    
(4)3.2x-9.8=9.4
(5)x+4.6×3=16.9    
(6)7×5-5x=33.5
(7)x-0.64=36    
(8)4(2x一0.8x)=16.8
(9)3.6x+2.4x-3.6=0.
▼优质解答
答案和解析
(1)7x+4=46,
      7x+4-4=46-4,
       7x÷7=42÷7,
           x=6;
    
(2)9x-15=57,
  9x-15+15=57+15,
     9x÷9=72÷9,
         x=8;

(3)96+12x=144,
  96+12x-96=144-96,
    12x÷12=48÷12,
          x=4;
    
(4)3.2x-9.8=9.4,
 3.2x-9.8+9.8=9.4+9.8,
    3.2x÷3.2=19.2÷3.2,
            x=6;

(5)x+4.6×3=16.9,
       x+13.8=16.9.
  x+13.8-13.8=16.9-13.8,
            x=3.1;
    
(6)7×5-5x=33.5,
    35-5x+5x=33.5+5x,
     35-33.5=33.5+5x-33.5,
      1.5÷5=5x÷5,
           x=0.3;

(7)x-0.64=36,
x-0.64+0.64=36+0.64,
          x=36.64;
    
(8)4(2x-0.8x)=16.8,
             4.8x=16.8,
        4.8x÷4.8=16.8÷4.8,
                x=3.5;

(9)3.6x+2.4x-3.6=0,
            6x-3.6=0+3.6,
             6x÷6=3.6÷6,
                 x=0.6.