浓度为20%的糖水60克，加入多少克糖能使浓度变为40%的糖水？
直接写出得数．×= 1÷0.9=÷0.8=×9÷×9= 5.6÷=×= 0÷=×=
直接写得数．×=÷14= 26×=÷28= 12×=×=×=×24=÷=÷=
直接写出得数．×16= 12÷= 0.3×=÷= 1÷= 0×+=×=÷= 0.75÷= 1﹣= 1÷0.01= 10﹣0.01=
直接写出得数= 6÷== 10÷= 3.14×16= 7×=×99==
口算 57÷×25= 15÷15%=×÷×= 0.36+0.64= 3.28+6.62= 1.25×1.5×8= 0.22=（+）×12= 9﹣0.9=
×
= 1÷0.9=
÷0.8=
×9÷
=
×
= 0÷
=
×
=
×
=
÷14= 26×
=
÷28= 12×
=
×
=
×
=
×24=
÷
=
÷
=
×16= 12÷
= 0.3×
=
= 1÷
= 0×
+
=
×
=
÷
= 1﹣
= 1÷0.01= 10﹣0.01=
= 6÷
=
= 10÷
=
=
×99=
=
×25= 15÷15%=
×
÷
×
+
）×12=
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