使用甲种农药每千克要兑水20千克，使用乙种农药每千克要兑水40千克．根据农科院专家的意见，把两种农药混起来用可以提高药效，现有两种农药共50千克，要配药水1400千克，那么，其中甲种农药用了多少千克？
直接写数对又快． 97﹣28=÷=×=×= 2.5×4=+= 8÷80%=×÷×=
÷2=+= 10÷=×6=×=÷= 9×= 15×（﹣）=
直接写得数=== 15.7+3==== 10+10%= 3﹣3÷5= 0.9×99+0.9=
1﹣65%= 1﹣1÷6= 0.32= 40×5%=+= 25%÷= 1﹣+= 0.125×0.125=
看谁算得快×=×÷×= 0.35×99=÷= 79﹣0.79=+= 10÷1%= 32×1.25%=
÷
=
×
=
×
=
+
= 8÷80%=
=
÷2=
+
= 10÷
=
×6=
×
=
÷
= 9×
= 15×（
﹣
）=
=
=
= 15.7+3=
=
=
= 10+10%= 3﹣3÷5= 0.9×99+0.9=
+
= 25%÷
+
= 0.125×0.125=
×
=
×
÷
×
= 0.35×99=
÷
=
+
= 10÷1%= 32×1.25%=
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