问题
解答题
|
答案
(1)
x÷3 4
=181 6
x÷3 4
×1 6
=18×1 6 1 6
x÷3 4
=3÷3 4 3 4
x=4;
(2)1-
x=4 15 1 5
1-
x+4 15
x=5 15
+1 5
x4 15
1=
+1 5
x4 15
+1 5
x-4 15
=1-1 5 1 5
x=4 15 4 5
x÷4 15
=4 15
÷4 5 4 15
x=3
(3)75÷
-5 6
x=0 8 9
90-
x=08 9
90-
x+8 9
x=0+8 9
x8 9
x=908 9
x÷8 9
=90÷8 9 8 9
x=
.405 4
(4)x+
=240x 5
1.2x=240
1.2x÷1.2=240÷1.2
x=200.