问题
解答题
求未知数X.
|
答案
①
X-2 3
X=1 1 5
X=17 15
X×7 15
=15 7 15 7
X=21 7
②1-
X=4 5 1 3
1+
X-4 5
X=4 5
+1 3
X4 5
X+4 5
-1 3
=1-1 3 1 3
X=4 5 2 3
X×4 5
=5 4
×2 3 5 4
X=5 6
③1÷(
X-4 5
)=31 5
1×(
X-4 5
)÷(1 5
X-4 5
)=3×(1 5
X-4 5
)1 5
3×(
X-4 5
)=11 5
X-12 5
=13 5
X+12 5
-3 5
=1+3 5 3 5
X=12 5 8 5
X×12 5
=5 12
×8 5 5 12
X=2 3