计算:(55/9−0.8+24/9)×(7.6÷4/5+22/5×1.25)=_.
问题描述:
计算:(5
−0.8+25 9
)×(7.6÷4 9
+24 5
×1.25)=______. 2 5
答
(5
−0.8+25 9
)×(7.6÷4 9
+24 5
×1.25)2 5
=[(5
+25 9
)−0.8]×(74 9
×3 5
+25 4
×2 5
),5 4
=(8−0.8)×
×(75 4
+23 5
),2 5
=7.2×
×10,5 4
=72×
,5 4
=90;
故答案为:90.