一项工程，甲队独做4天可以完成，乙队独做4天完成整个工作量的，这项工程两队合做多少天可以完成？
直接写出得数． 16×=×=×=÷=÷= 9÷=××=
直接写得数×5=÷= 10×=÷=×÷×= 99×+= 3﹣﹣= 1÷4×= （）÷6=÷÷1=
直接写出得数．×40== 25×==== 1﹣50%=÷==×=
直接写得数．×=÷2=×14= 10×=×2=×=÷=÷=
直接写出得数×10=+= 52×= 9÷=÷= 11﹣= 0÷×=﹣+= 1÷9×=
，这项工程两队合做多少天可以完成？
=
×
=
×
=
÷
=
÷
= 9÷
=
×
×
=
×5=
÷
= 10×
=
÷
=
×
÷
×
+
= 3﹣
﹣
= 1÷4×
=
）÷6=
÷
÷1=
×40=
= 25×
=
=
=
= 1﹣50%=
÷
=
=
×
=
×
=
÷2=
×14= 10×
=
×2=
×
=
÷
=
÷
=
×10=
+
= 52×
=
=
÷
= 11﹣
=
×
=
﹣
+
= 1÷9×
=
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