解方程或解比例 6×3-1.8x=7.2 10:x=
作者&投稿:柯蚂 (若有异议请与网页底部的电邮联系)
1.8x-6×3=7.2解方程~
18-1.8x=7.2,
18-1.8x+1.8x=7.2+1.8x,
18=7.2+1.8x,
18-7.2=7.2+1.8x-7.2,
10.8=1.8x,
10.8÷1.8=1.8x÷1.8,
x=6;
(2)10:x=4.5:0.8,
4.5x=10×0.8,
4.5x=8,
4.5x÷4.5=8÷4.5,
x=
;
(3)
:
=x:
,
x=
×
,
x=
,
x÷
=
÷
,
x=
.
1.8x-18=7.2
1.8x=7.2+18
x=25.2÷1.8
x=14
(1)8.2:x=1.8:3.6 1.8x=8.2×3.6 1.8x=29.52 x=16.4(2) 1 2 : 2 3 =6:x 1 2 x= 2 3 ×6 1 2 x=4 x=8(3) 0.6 3.2 = x 8 3.2x=0.6×83.2x=4.8 x=1.5(4)x+ 1 3 x =24 4 3 x=24 4 3 x× 3 4 =24× 3 4 x=18
(1)6×3-1.8x=7.2,18-1.8x=7.2,
18-1.8x+1.8x=7.2+1.8x,
18=7.2+1.8x,
18-7.2=7.2+1.8x-7.2,
10.8=1.8x,
10.8÷1.8=1.8x÷1.8,
x=6;
(2)10:x=4.5:0.8,
4.5x=10×0.8,
4.5x=8,
4.5x÷4.5=8÷4.5,
x=
16 |
9 |
(3)
1 |
4 |
1 |
8 |
1 |
10 |
1 |
8 |
1 |
4 |
1 |
10 |
1 |
8 |
1 |
40 |
1 |
8 |
1 |
8 |
1 |
40 |
1 |
8 |
x=
1 |
5 |