求未知数x.
|
(1)4x+3×0.7=6.5,
4x+2.1-2.1=6.5-2.1,
4x=4.4,
4x÷4=4.4÷4,
x=1.1;
(2)
:1 2
=1 5
:x,1 4
x=1 2
×1 5
,1 4
x÷1 2
=1 2
÷1 20
,1 2
x=
;1 10
(3)
=1.5 x
,3.6 1.8
3.6x=1.5×1.8,
3.6x=2.7,
3.6x÷3.6=2.7÷3.6,
x=
.3 4
求未知数x.
|
(1)4x+3×0.7=6.5,
4x+2.1-2.1=6.5-2.1,
4x=4.4,
4x÷4=4.4÷4,
x=1.1;
(2)
:1 2
=1 5
:x,1 4
x=1 2
×1 5
,1 4
x÷1 2
=1 2
÷1 20
,1 2
x=
;1 10
(3)
=1.5 x
,3.6 1.8
3.6x=1.5×1.8,
3.6x=2.7,
3.6x÷3.6=2.7÷3.6,
x=
.3 4