一项工程，甲独做10小时完成，乙独做3小时可完成这项工程的
．如果甲乙合做2小时后，再由甲独做，还要几小时可完成这项工程？
相关试题
+
= 
﹣
）= 0.25×12= 3.28×0×72%= 4.62+6.8=
= 
= 
= 
=
= 99×0.25+0.25= 
= 7.2÷100﹣0.72÷10=
= 
=直接写出得数．
138+17= 83﹣57= 4708﹣999= 402×5= 20×500=
320÷80= 15.7+3= 10.9+1.09= 1﹣0.09= 0.9﹣0.26=
4×3.14= 3.25×4= 6.4÷0.8= 0.48÷0.03= 
+
=
+
= 
×4= 
×
= 24÷
= 
+÷+=
直接写得数．
25+46= 432﹣198= 30×40= 4.5÷0.5=
2﹣
= 36×25%= 560÷80= 
÷
=
273+87+27= 0.25×0.125×4×8=
= （
+
）×6= 
+0.2= （
+
）÷
×7÷
×（3.125﹣3
）=
粤公网安备 44130202000953号