女工有20人，男工与女工的比是4：5，男工人有多少人？
直接写出得数．= = = 10﹣8.9=（）×24= 42÷= 2.7×= 5.2÷10%=
直接写出得数． ﹣= 8.73+27= ×3= ×=0.3×= 5﹣= 8.4÷0.7= 0.75÷=
直接写得数．×= += 2.78+2.12= 1.25×8=6÷= ﹣= ÷= 81÷0.3=
直接写得数．×45= += 6.3÷0.01= 2.5+1.25= 6﹣﹣=÷= 390×0.02= 510﹣240= 0.13= 10×÷10×=
直接写出得数﹣= += ×=÷= ×= 1﹣=
= 
= 
= 10﹣8.9=
）×24= 42÷
= 2.7×
= 5.2÷10%=
﹣
= 8.73+27= 
×3= 
×
=
= 5﹣
= 8.4÷0.7= 0.75÷
=
×
= 
+
= 2.78+2.12= 1.25×8=
= 
﹣
= 
÷
= 81÷0.3=
×45= 
+
= 6.3÷0.01= 2.5+1.25= 6﹣
﹣
=
÷
= 390×0.02= 510﹣240= 0.13= 10×
÷10×
=
﹣
= 
+
= 
×
=
÷
= 
×
= 1﹣
=
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