化简下列各比,并求出比值. 3:2.5 2 5 :2
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3:2.5, =(3×10):(2.5×10), =30:25, =(30÷5):(25÷5), =6:5; 3:2.5, =3÷2.5, =1.2,
=(
=1:5;
=
=0.2;
=(
=3:2;
=
=1.5; 0.75小时:15分, =45分:15分, =45:15, =(45÷15):(15÷15), =3:1; 0.75小时:15分, =45分:15分, =45÷15, =3. |
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