三个相同容器中各装满盐水，第一个容器中盐与水的比是1：7，第二个容器中盐与水的比是2：5，第三个容器中盐与水的比是1：3，把这三个容器的盐水都倒入另一个大容器中，问混合溶液中盐与水的比是多少？
计算 21÷121÷．
直接写得数×0.25=÷= 2×÷= 6.3×=÷= 2﹣﹣= 2.6×11﹣2.6= 1.8×4×0.5=
口算我最棒!=========
口算×=×= 12×=+3=÷=÷4=×= 5÷=
直接写得数======
121÷
．
×0.25=
÷
= 2×
÷
=
÷
= 2﹣
﹣
= 2.6×11﹣2.6= 1.8×4×0.5=
=
=
=
=
=
=
=
=
=
×
×
= 12×
=
+3=
÷
=
÷4=
×
= 5÷
=
=
=
=
=
=
=
粤公网安备 44130202000953号