5. 婷婷在计算$500 - □ ÷ 5$时,先算了减法,再算除法,得到的错误结果是90。正确结果应该是多少?
答案
$90×5=450$
$500-450=50$
$500-50÷5$
$=500-10$
$=490$
答:正确结果应该是490。
$500-450=50$
$500-50÷5$
$=500-10$
$=490$
答:正确结果应该是490。
● 看图列式并解答。

答案
12×3 + 4
= 36 + 4
= 40(个)
答:梨有40个。
= 36 + 4
= 40(个)
答:梨有40个。
● 算一算。
130 + 645 ÷ 5 =
81 × 7 ÷ 9 =
75 + 15 × 12 =
105 ÷ 5 × 82 =
130 + 645 ÷ 5 =
81 × 7 ÷ 9 =
75 + 15 × 12 =
105 ÷ 5 × 82 =
答案
130 + 645 ÷ 5
= 130 + 129
= 259
81 × 7 ÷ 9
= 567 ÷ 9
= 63
75 + 15 × 12
= 75 + 180
= 255
105 ÷ 5 × 82
= 21 × 82
= 1722
= 130 + 129
= 259
81 × 7 ÷ 9
= 567 ÷ 9
= 63
75 + 15 × 12
= 75 + 180
= 255
105 ÷ 5 × 82
= 21 × 82
= 1722
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