问题
解答题
|
答案
(1)
X=405 8
X×5 8
=40×8 5 8 5
X=64;
(2)X:
=4 7 2 3
X=
×4 7 2 3
X=
;8 21
(3)
X=2 5
×4 9 3 8
X=2 5 1 6
X×2 5
=5 2
×1 6 5 2
X=
;5 12
(4)
x-3 5
+4 7
=13 7
x-3 5
=11 7
x-3 5
+1 7
=1+1 7 1 7
x=3 5 8 7
x×3 5
=5 3
×8 7 5 3
x=
;40 21
(5)(
+3.2)x=4 5 2 3
(0.8+3.2)x=2 3
4x=2 3
4x÷4=
÷42 3
x=
.1 6