15克盐放入135克水中，放置一段时间后，盐水重量变为120克，这时盐水的浓度是多少？浓度比原来提高了百分之几？
计算．====×26= 12÷=×=÷=
直接写出的数．====%======
只列式不计算﹣= 1.25×8= 2.7×=÷2= 1÷0.8=×= 1﹣÷1﹣=×0.8+×=
直接写出得数． 72=﹣= 6﹣= 14÷21=×÷= 0.22= 1÷=÷60%= 10﹣2÷25%= 24%×5=
直接写得数．×=+=﹣=+=×=÷=﹣=×= 14×= 20÷= 0×=×23×1=
=
=
=
=
×26= 12÷
=
×
=
÷
=
=
=
=
=
%=
=
=
=
=
=
﹣
= 1.25×8= 2.7×
=
÷2=
×
= 1﹣
÷1﹣
×
﹣
= 6﹣
×
÷
= 0.22= 1÷
=
÷60%=
×
=
+
=
﹣
=
+
=
×
=
=
﹣
=
×
=
= 20÷
= 0×
=
×23×1=
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