4/8Ⅹ5/9=5/18
能约分,先约分,再计算简便
如图
解:8分之4乘9分之五等于( 5/18 )
∵已知需求出8分之4乘9分之五等于多少
X × Y = X * Y = Z
∴8分之4乘9分之五
= 4/8 × 5/9
= 1/2 × 5/9
= (1×5)/( 2×9)
= 5/18
答:8分之4乘9分之五等于5/18
4/8x5/9
=20/72
=5/18
4/8X5/9=5/18
等于18分之5