解方程. 1/6:4/5=x:48 (1+2/3)x=6.25 0.26×3-0.9x=6%
问题描述:
解方程.
| (1+
| 0.26×3-0.9x=6% |
答
(1)
:1 6
=x:48,4 5
x=4 5
×48,1 6
x÷4 5
=4 5
×48÷1 6
,4 5
x=10;
(2)(1+
)x=6.25,2 3
x=6.25,5 3
x÷5 3
=6.25÷5 3
,5 3
x=3.75;
(3)0.26×3-0.9x=6%,
0.78-0.9x=6%,
0.78-0.9x+0.9x=6%+0.9x,
0.78=6%+0.9x,
0.78-6%=6%+0.9x-6%,
0.72=0.9x,
0.72÷0.9=0.9x÷0.9,
x=0.8.