问题
解答题
(1)解方程:
(2)解不等式:
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答案
(1)
-2=y,y-1 2
-y 2
-2=y,1 2
-y 2
=y,5 2
-y 2
-5 2
=y-y 2
,y 2
=-y 2
,5 2
×2=-y 2
×2,5 2
y=-5;
(2)
-2x 7
>6-5x 14
,3 2
(
-2x 7
)×14>6-5x 14
×14,3 2
4x-6+5x>21,
9x-6>21,
9x-6+6>21+6,
9x÷9>27÷9,
x>3.