5.根据下表列出相应的综合算式,并计算。


答案
5. 325-(48+32) = 325-80 = 245
120-8×5 = 120-40 = 80
(331-277)÷6 = 54÷6 = 9
32÷(2×4) = 32÷8 = 4
120-8×5 = 120-40 = 80
(331-277)÷6 = 54÷6 = 9
32÷(2×4) = 32÷8 = 4
6.把下面每组算式合并成综合算式,写出计算结果。
(1)130 - 78 = 52
59 + 52 = 111
算式:
(2)27 - 18 = 9
27 ÷ 9 = 3
算式:
(3)12 ÷ 2 = 6
6 ÷ 3 = 2
算式:
(4)40 - 35 = 5
5 × 7 = 35
算式:
(1)130 - 78 = 52
59 + 52 = 111
算式:
59+(130-78)=111
(2)27 - 18 = 9
27 ÷ 9 = 3
算式:
27÷(27-18)=3
(3)12 ÷ 2 = 6
6 ÷ 3 = 2
算式:
12÷2÷3=2(或 12÷(6÷3)=6)
(4)40 - 35 = 5
5 × 7 = 35
算式:
(40-35)×7=35(或 40-5×7=5)
答案
6.(1) 59+(130-78)=111
(2) 27÷(27-18)=3
(3) 12÷2÷3=2(或 12÷(6÷3)=6)
(4) (40-35)×7=35(或 40-5×7=5)
(2) 27÷(27-18)=3
(3) 12÷2÷3=2(或 12÷(6÷3)=6)
(4) (40-35)×7=35(或 40-5×7=5)
7.看图列式计算。

答案
(13-4)×4 = 9×4 = 36(箱)
8.在合适的位置添上括号,使式子成立。
(1)$130 - (85 + 43) = 2$
(2)$(4 + 3)×8 = 56$
(3)$80 - (24 - 16) > 80 - 24 - 16$
(4)$16 ÷ (4 ÷ 2) < 16 ÷ 4 ÷ 2$
(1)$130 - (85 + 43) = 2$
(2)$(4 + 3)×8 = 56$
(3)$80 - (24 - 16) > 80 - 24 - 16$
(4)$16 ÷ (4 ÷ 2) < 16 ÷ 4 ÷ 2$
答案
(1) $130 - (85 + 43) = 2$
(2) $(4 + 3)×8 = 56$
(3) $80 - (24 - 16) > 80 - 24 - 16$
(4) $16 ÷ 4 ÷ 2 < 16 ÷ (4 ÷ 2)$
(2) $(4 + 3)×8 = 56$
(3) $80 - (24 - 16) > 80 - 24 - 16$
(4) $16 ÷ 4 ÷ 2 < 16 ÷ (4 ÷ 2)$
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