求未知数X:14:12=x:25;1.250.25=x1.6;4:
求未知数X:14:12=x:25;1.250.25=x1.6;4:1=x:12;(x+7):6=7:2.1....
求未知数X:14:12=x:25;1.250.25=x1.6;4:1=x:12;(x+7):6=7:2.1.
展开
展开全部
(1)
:12=x:
,
12x=
×
,
12x=
,
12x÷12=
÷12,
x=
;
(2)
=
,
0.25x=1.25×1.6,
0.25x=2,
0.25x÷0.25=2÷0.25,
x=8;
(3)4:1=x:
,
x=4×
,
x=2;
(4)(x+7):6=7:2.1,
(x+7)×2.1=6×7,
2.1x+14.7-14.7=42-14.7,
2.1x=27.3,
2.1x÷2.1=27.3÷2.1,
x=13.
1 |
4 |
2 |
5 |
12x=
1 |
4 |
2 |
5 |
12x=
1 |
10 |
12x÷12=
1 |
10 |
x=
1 |
120 |
(2)
1.25 |
0.25 |
x |
1.6 |
0.25x=1.25×1.6,
0.25x=2,
0.25x÷0.25=2÷0.25,
x=8;
(3)4:1=x:
1 |
2 |
x=4×
1 |
2 |
x=2;
(4)(x+7):6=7:2.1,
(x+7)×2.1=6×7,
2.1x+14.7-14.7=42-14.7,
2.1x=27.3,
2.1x÷2.1=27.3÷2.1,
x=13.
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询