知识大全 (1)4÷23x=25(2)8(x-2)=2(x+7)(3)320:18%=6.5x.
Posted 方程
篇首语:今日长缨在手,何时缚住苍龙。本文由小常识网(cha138.com)小编为大家整理,主要介绍了知识大全 (1)4÷23x=25(2)8(x-2)=2(x+7)(3)320:18%=6.5x.相关的知识,希望对你有一定的参考价值。
解方程,我没问题!(1)4÷23x=25(2)8(x-2)=2(x+7)(3)320:18%=6.5x.
(1)方程变形得:
4 |
15 |
x=4,
解得:x=15;
(2)去括号得:8x-16=2x+14,
移项合并得:6x=30,
解得:x=5;
(3)方程变形得:
3 |
20 |
×
100 |
18 |
=
6.5 |
x |
,即
5 |
6 |
=
6.5 |
x |
,
解得:x=7.8,
经检验x=7.8是分式方程的解.
解方程,我没问题!4÷X=25 8(x-2)=2(x+7) 320:18%=6.5x.
(1)4÷X=
2 |
5 |
,
4÷X×X=
2 |
5 |
X,
2 |
5 |
X=4,
2 |
5 |
X÷
2 |
5 |
=4÷
2 |
5 |
,
X=10;
(2)8(x-2)=2(x+7),
8X-16=2X+14,
6X-16=14,
6X=30,
X=5;
(3)
3 |
20 |
:18%=
6.5 |
X |
,
3 |
20 |
X=0.18×6.5,
3 |
20 |
X=1.17,
X=7.8.
解方程,我没问题!4÷23X=25 8(x-2)=2(x+7...
(1)4÷
2 |
3 |
x=
2 |
5 |
,
4÷
2 |
3 |
x×
2 |
3 |
x=
2 |
5 |
×
2 |
3 |
x,
4 |
15 |
x=4,
4 |
15 |
x×
15 |
4 |
=4×
15 |
4 |
,
x=15;
(2)8(x-2)=2(x+7),
8x-16=2x+14,
8x-16-2x=2x+14-2x,
6x-16=14,
6x-16+16=14+16,
6x÷6=30÷6,
x=5;
(3)
3 |
20 |
:18%=
6.5 |
x |
,
3 |
20 |
x=18%×6.5,
3 |
20 |
x×
20 |
3 |
=1.17×
20 |
3 |
,
x=7.8.
解方程,我没问题!4÷ 2 3 X= 2 5 8(x-2)=2(x+7) 3 20 :18%=
(1) 4÷
,
x×
x=
×
x ,
x=4 ,
x×
=4×
, (2)8(x-2)=2(x+7), (3)
:18%=
,
x=18%×6.5 ,
x×
=1.17×
, |
解方程,我没问题X:25= 2 5 5X-5× 1 3 =0.88(X-2)=2(X+7)
(1)X:25=
5x=25×2, 5x÷5=50÷5, x=10; (2)5x-5×
=0.8,
=0.8,
+
=0.8 +
,
÷ 5,
; (3)8(x-2)=2(x+7), |
解方程: 6÷23X=35 8(X-2)=2(X+7) 4X?83X+8=45
(1)6÷
2 |
3 |
X=
3 |
5 |
,
6÷
2 |
3 |
X×
2 |
3 |
X=
3 |
5 |
×
2 |
3 |
X,
2 |
3 |
X×
3 |
5 |
=6,
2 |
5 |
X=6,
2 |
5 |
X÷
2 |
5 |
=6÷
2 |
5 |
,
X=15;
(2)8(X-2)=2(X+7),
8X-16=2X+14,
8X-16-2X=2X+14-2X,
6X-16=14,
6X-16+16=14+16,
6X=30,
6X÷6=30÷6,
X=5;
(3)
4X?8 |
3X+8 |
=
4 |
5 |
,
5(4X-8)=4(3X+8),
20X-40=12X+32,
20X-40-12X=12X+32-12X,
8X-40=32,
8X-40+40=32+40,
8X=72,
8X÷8=72÷8,
X=9.
解方程,我没问题!①x- 2 9 x=21② 3 20 :18%= 6.5 x .
①x-
(1-
)x=21,
x=21,
x×
=21×
, ②
:18%=
,
x=18%×6.5,
x=1.17,
x×
=1.17×
, |
解方程,我没问题X:25= 2 5 5X-5× 1 3 =0.8 X 8
(1)X:25=
5x=25×2, 5x÷5=50÷5, x=10; (2)5X-5×
=0.8,
+
=0.8+
,
÷5,
; (3)
-4.5+5.5=10,
-4.5+5.5+4.5-5.5=10+4.5-5.5,
×8=9×8, |
解方程,我没问题!x-25%x=24 3 4 x- 4 5 +0.2= 1 2
(1)x-25%x=24, 75%x=24, 75%x÷75%=24÷75%, x=32;(2)
x-
+0.2=
,
x-0.6=
,
x-0.6+0.6=
+0.6,
x=
,
x÷
=
÷
,
. |
解方程 75%x- 1 2 x=1 7 8 ×6 6(x-2)=4(x+7),x:12= 3 20 :18
(1)75%x-
×6,
,
÷25%, (2)6(x-2)=4(x+7), (3)x:12=
:18%,
, |
相关参考