______:12= 6 8 =______÷20=______%=______(用小数表示
______:12=68=______÷20=______%=______(用小数表示)...
______:12= 6 8 =______÷20=______%=______(用小数表示)
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(1)(2) =6:8=3:4=(3×3):(4×3)=9:12, =3:4=3÷4=(3×5)÷(4×5)=15:20; (3)(4) =3:4=3÷4=0.75=75%; 所以 9:12= =15÷20=75%=0.75(用小数表示); 故答案为:9,15,75,0.75. |
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