2.8:五分之四=0.7:X 用比例解

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2.8:五分之四=0.7:X用比例解2.8:五分之四=0.7:X用比例解2.8:五分之四=0.7:X用比例解2.8:五分之四=0.7:X2.8x=0.8×0.72.8x=0.56x=0.22.8:五分

2.8:五分之四=0.7:X 用比例解
2.8:五分之四=0.7:X 用比例解

2.8:五分之四=0.7:X 用比例解
2.8:五分之四=0.7:X
2.8x=0.8×0.7
2.8x=0.56
x=0.2

2.8:五分之四=0.7:X
2.8:0.8=0.7:X
2.8x=0.8*0.7
2.8x=0.56
x=0.2
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2.8:五分之四=0.7:X
2.8x=4/5×0.7
x=0.2

2.8:五分之四=0.7:X
2.8x=0.7*4/5
x=0.7*0.8/2.8=0.2