题目
现有四个有理数2、3、7、9,将这四个数(每个数用且只用一次)进行加、减、乘、除四则运算使其结果等于24,请你写出3个符合条件的算式______、______、______.
提问时间:2021-02-10
答案
(1)2×(3×7-9),
=2×(21-9),
=2×12=24;
(2)3×(7-2)+9,
=3×5+9,
=15+9,
=24;
(3)(7+9)÷2×3,
=16÷2×3,
=8×3,
=24;
故答案为:(1)2×(3×7-9),(2)3×(7-2)+9,(3)(7+9)÷2×3,
=2×(21-9),
=2×12=24;
(2)3×(7-2)+9,
=3×5+9,
=15+9,
=24;
(3)(7+9)÷2×3,
=16÷2×3,
=8×3,
=24;
故答案为:(1)2×(3×7-9),(2)3×(7-2)+9,(3)(7+9)÷2×3,
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