问题
解答题
|
答案
①0.3x=0.45,
0.3x÷0.3=4.5÷0.3,
x=15,
②x-
+7 11
=1 7
,39 77
x-
+49 77
=11 77
,39 77
x+
-49 77
+49 77
-11 77
=11 77
+39 77
-49 77
,11 77
x=1;
③5x-4.3x=65.8+4.2,
0.7x=70,
0.7x÷0.7=70÷0.7,
x=100;
④6-(x+
)=0.25×20,3 5
6-x-
=5,3 5
5
-x=5,2 5
5.4-5+x-x=5-5+x,
x=0.4.