28-(35%
28-(35% 15%)x13?
15%)x13?
这是一题百分数的解方程,先把括号里面的看成一个减救,减数被减数一差,所以。(35% 15%)x28-13,来计算,50%x15,把百分数约分得:1/2x15,求x,求一个因数积÷另外一个因数,所x15÷1/2,所以x15x2所以x30。解百分数的方程能化简时一定要化简,这样可以让计算简便。所以x30
出40道包含小数、分数、百分数的方程?
1:3/8 x-25c6f70797a686964616f31333361306361x4 2:x÷430% 3:3x 20%x112 4:x-40%x3.6
﹙3/8-25%﹚x4 x30%×4 3·2 x112 60%x3·6
1/8x 4 x1.2 x35 x6
x32
5:14%x-9.10.7 6:75%x-25%x16 7:x-20%x44×50% 8:x-10
14%x9.8 0.5x160.0.8x22 0.9 x18
x70 x32 x27.5 x20
9 :60%x 2540 10:2x 30%x9.2 11:1÷x85% 12;40%x-5/123/4
0.6x15 2.3x9.2 x1÷0.85 解 :0.4 x3/4 5/12
x25 x4 x20/17 x7/6÷2/5
x35/12
13:2﹙x 7﹚-3.620.8 14 :x-5.53.5-x 15:160×25%-1.3x17.9 16:3/8÷x4/15÷4/9
解 2﹙x 7﹚24.4 2x3.5 5.5 1.3x40-17.9 3/8÷x3/5
x 712.2 2x9 1.3x22.1 x3/8÷3/5
x5.2 x4.5 x17 x5/8
17:x÷2/77/3÷3/8 18:3/4 x 1/2 x45×1/3 19:0.18×3-2x0.5 20:0.6÷35%1/5÷x
x÷2/756/9 1.25x15 2x0.54-0.5 1/5÷x12/7
x56/9×2/7 x15÷1.25 x0.04÷2 x1/5÷12/7
x16/9 x12 x0.02 x7/60