早教吧 育儿知识 作业答案 考试题库 百科 知识分享

解方程:x-6.75=1.684×(0.3+x)=4.80.7x+6×5=37,1.2x-0.8x=4.820+x=367x-5×5=590.7x=4.2(10-7.5)x=1.

题目详情
解方程:
x-6.75=1.68       4×(0.3+x)=4.8         0.7x+6×5=37, 1.2x-0.8x=4.8
20+x=36               7x-5×5=59              0.7x=4.2                   (10-7.5)x=1.

x-6.75=1.68       4×(0.3+x)=4.8         0.7x+6×5=37, 1.2x-0.8x=4.8
20+x=36               7x-5×5=59              0.7x=4.2                   (10-7.5)x=1.
x-6.75=1.68       4×(0.3+x)=4.8         0.7x+6×5=37, 1.2x-0.8x=4.8x-6.75=1.68      4×(0.3+x)=4.8        0.7x+6×5=37,1.2x-0.8x=4.8 20+x=36               7x-5×5=59              0.7x=4.2                   (10-7.5)x=1.20+x=36              7x-5×5=59             0.7x=4.2                  (10-7.5)x=1.
▼优质解答
答案和解析
(1)x-6.75=1.68
   x-6.75+6.75=1.68+6.75
             x=8.43

(2)4×(0.3+x)=4.8 
          1.2+4x=4.8
      1.2+4x-1.2=4.8-1.2
              4x=3.6
           4x÷4=3.6÷4
               x=0.9

(3)0.7x+6×5=37
       0.7x+30=37
    0.7x+30-30=37-30
          0.7x=7
     0.7x÷0.7=7÷0.7
             x=10

(4)1.2x-0.8x=4.8
          0.4x=4.8
     0.4x÷0.4=4.8÷0.4
             x=12

(5)20+x=36
  20+x-20=36-20
        x=16

(6)7x-5×5=59 
       7x-25=59 
    7x-25+25=59+25
          7x=84
       7x÷7=84÷7
           x=12

(7)0.7x=4.2
0.7x÷0.7=4.2÷0.7
        x=6

(8)(10-7.5)x=1
            2.5x=1
       2.5x÷2.5=1÷2.5
               x=0.4