
解:3.78÷21等于( 9/50 ),【即等于0.18】
∵已知需求出3.78÷21等于多少
A ÷ B = A / B = C
∴3.78 ÷ 21
= (3×100+78)/100 × 1/21
= 378/100 × 1/21
= 189/50 × 1/21
= 9/50
= 0.18
答:3.78÷21等于9/50,【即等于0.18】

解:3.78÷21等于( 9/50 ),【即等于0.18】
∵已知需求出3.78÷21等于多少
A ÷ B = A / B = C
∴3.78 ÷ 21
= (3×100+78)/100 × 1/21
= 378/100 × 1/21
= 189/50 × 1/21
= 9/50
= 0.18
答:3.78÷21等于9/50,【即等于0.18】