|
(1)5
X-4=60,1 3
5
X-4+4=60+4,1 3
5
X=64,1 3
X×16 3
=64×3 16
,3 16
X=12;
(2)5-
X=35 8
,1 3
5-
X+5 8
X=35 8
+1 3
X,5 8
3
+1 3
X=5,5 8
3
+1 3
X-35 8
=5-31 3
,1 3
X=5 8
,5 3
X×5 8
=8 5
×5 3
,8 5
X=
;8 3
(3)1
÷X=24 21
-15 6
,4 9
1
÷X×X=4 21
×X,25 18
X=25 18
,25 21
X×25 18
=18 25
×25 21
,18 25
X=
;6 7
(4)7.5:X=1.5,
1.5X=7.5,
1.5X÷1.5=7.5÷1.5,
X=5.