解:3/4÷[(百分之25+3/5)-百分之75]等于( 15/2 ),【即等于7.5】
∵已知需求出3/4÷[(25%+3/5)-75%]等于多少
∴3/4 ÷ [(25% + 3/5) - 75%]
= 3/4 ÷ (25/100 + 3/5 - 75/100)
= 3/4 ÷ (1/4 + 3/5 - 3/4)
= 3/4 ÷ (1/4 - 3/4 + 3/5)
= 3/4 ÷ (-2/4 + 3/5)
= 3/4 ÷ (-1/2 + 3/5)
= 3/4 ÷ (-5/10 + 6/10)
= 3/4 ÷ 1/10
= 3/4 × 10
= 15/2
= 7.5
答:3/4÷[(百分之25+3/5)-百分之75]等于15/2,【即等于7.5】
3/4÷[(25%+3/5)-75%]
=3/4÷(1/4+3/5-3/4)
=3/4÷【3/5-(3/4-1/4)】
=3/4÷(3/5-1/2)
=3/4÷1/10
=15/2
3/4÷[(25%+3/5)-75%]
=3/4÷(0.25+0.6-0.75)
=0.75÷0.1
=7.5.