解方程(1)(100+x)÷25=5(2)(1+80%)x=360(3)1-25%x=14

解方程(1)(100+x)÷25=5(2)(1+80%)x=360(3)1-25%x=14.
2025-02-10 15:51:47
推荐回答(1个)
回答1:

(1)(100+x)÷25=5,
     (100+x)÷25×25=5×25,
                 100+x=125,
             100+x-100=125-100,
                     x=25;

(2)(1+80%)x=360,
           1.8x=360,
      1.8x÷1.8=360÷1.8,
              x=200;

(3)1-25%x=

1
4

        1-0.25x=0.25,
  1-0.25x+0.25x=0.25+0.25x,
     0.25+0.25x=1,
0.25+0.25x-0.25=1-0.25,
          0.25x=0.75,
    0.25x÷0.25=0.75÷0.25,
              x=3.