问题
解答题
解方程. (1)3x-
(2)3x-1.2x=36. |
答案
(1)3x-
=11.625,3 8
3x-
+3 8
=11.625+3 8
,3 8
3x=11.625+0.375,
3x=12,
3x÷3=12÷3,
x=4;
(2)3x-1.2x=36,
1.8x=36,
1.8x÷1.8=36÷1.8,
x=20.
解方程. (1)3x-
(2)3x-1.2x=36. |
(1)3x-
=11.625,3 8
3x-
+3 8
=11.625+3 8
,3 8
3x=11.625+0.375,
3x=12,
3x÷3=12÷3,
x=4;
(2)3x-1.2x=36,
1.8x=36,
1.8x÷1.8=36÷1.8,
x=20.