三、计算下面各题。
460÷(109-946÷11) 25×32÷(155-139)
44×[169-(78+35)] 72÷[960÷(245-165)]
460÷(109-946÷11) 25×32÷(155-139)
44×[169-(78+35)] 72÷[960÷(245-165)]
答案
20 50 2464 6
解析
460÷(109-946÷11)
=460÷(109-86)
=460÷23
=20
25×32÷(155-139)
=25×32÷16
=25×2
=50
44×[169-(78+35)]
=44×[169-113]
=44×56
=2464
72÷[960÷(245-165)]
=72÷[960÷80]
=72÷12
=6
=460÷(109-86)
=460÷23
=20
25×32÷(155-139)
=25×32÷16
=25×2
=50
44×[169-(78+35)]
=44×[169-113]
=44×56
=2464
72÷[960÷(245-165)]
=72÷[960÷80]
=72÷12
=6
四、计算下面图形的面积。




答案
8×2÷2=8(cm²)
7×10=70(dm²)
(17 + 19)× 8 ÷ 2 =
144(m²)
(4+8)×6÷2-4×2÷
2=32(m²)
7×10=70(dm²)
(17 + 19)× 8 ÷ 2 =
144(m²)
(4+8)×6÷2-4×2÷
2=32(m²)
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