问题
解答题
求未知数x.
|
答案
(1)5x-0.7×3=6.6,
5x-2.1=6.6,
5x-2.1+2.1=6.6+2.1,
5x=8.7,
5x÷5=8.7÷5,
x=1.74;
(2)
:x=5,1 5
5x=
,1 5
5x÷5=
÷5,1 5
x=
;1 25
(3)x÷(1-24%)=1.15,
x÷76%=1.15,
x÷76%×76%=1.15×76%,
x=0.874.
求未知数x.
|
(1)5x-0.7×3=6.6,
5x-2.1=6.6,
5x-2.1+2.1=6.6+2.1,
5x=8.7,
5x÷5=8.7÷5,
x=1.74;
(2)
:x=5,1 5
5x=
,1 5
5x÷5=
÷5,1 5
x=
;1 25
(3)x÷(1-24%)=1.15,
x÷76%=1.15,
x÷76%×76%=1.15×76%,
x=0.874.