甲、乙两数的和是80，甲：乙=5：3．甲和乙各是多少？
一个数的是，这个数是多少？
÷=÷12=÷= 1÷= 5÷=÷21=÷=÷=÷=÷=×=﹣=
= 4÷==÷2=×= 100÷= 88÷= 4×=
直接写得数． 5÷20%= 1﹣80%= 2.5%×40= 0.8÷1%=
直接写得数．×=÷=÷4= 1÷= 0.25÷0375= 28÷=÷= 9÷= 12÷= 0÷×=
是
，这个数是多少？
÷
=
÷12=
÷
= 1÷
=
=
÷21=
÷
=
÷
=
÷
=
÷
=
×
=
﹣
=
= 4÷
=
=
÷2=
×
= 100÷
= 88÷
= 4×
=
1﹣80%= 2.5%×40= 0.8÷1%=
×
=
÷
÷4=
= 0.25÷0375= 28÷
=
÷
= 9÷
= 12÷
=
×
=
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