女儿今年10岁妈妈今年34岁几年前妈妈是女儿的四倍小学解答?
9个回答
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解:(1)(43-11)÷(3-1)-11,
=32÷2-11,
=16-11,
=5(年);
答:5年后,妈妈的年龄是女儿的3倍.
11-(43-11)÷(5-1),
=11-32÷4,
=11-8,
=3(年);
答:3年前,妈妈的年龄是女儿的5倍.
(2)用0、1、2、3、4这5个数字,能组成的没有重复数字的三位数有:
102,103,104,120,130,140,123,124,132,134,142,143,201,203,204,210,230,240,213,214,231,234,241,243,301,302,304,310,320,340.312,314,321,324,341,342,401,402,403,410,420,430,412,413,421,423,431,432,一共48个;
其中偶数有:102,104,120,130,124,132,134,142,140,142,210,230,240,214,234,302,304,310,320,340,312,314,324,342,402,410,420,430,412,432,一共30个;
答:能组成48个没有重复数字的三位数;其中偶数共有30个.
=32÷2-11,
=16-11,
=5(年);
答:5年后,妈妈的年龄是女儿的3倍.
11-(43-11)÷(5-1),
=11-32÷4,
=11-8,
=3(年);
答:3年前,妈妈的年龄是女儿的5倍.
(2)用0、1、2、3、4这5个数字,能组成的没有重复数字的三位数有:
102,103,104,120,130,140,123,124,132,134,142,143,201,203,204,210,230,240,213,214,231,234,241,243,301,302,304,310,320,340.312,314,321,324,341,342,401,402,403,410,420,430,412,413,421,423,431,432,一共48个;
其中偶数有:102,104,120,130,124,132,134,142,140,142,210,230,240,214,234,302,304,310,320,340,312,314,324,342,402,410,420,430,412,432,一共30个;
答:能组成48个没有重复数字的三位数;其中偶数共有30个.
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答案:2年前,母亲的年龄是女儿的4倍!计算过程:(10-X)×4=34-X,X=2。
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解:(1)(43-11)÷(3-1)-11,
=32÷2-11,
=16-11,
=5(年);
答:5年后,妈妈的年龄是女儿的3倍.
11-(43-11)÷(5-1),
=11-32÷4,
=11-8,
=3(年);
答:3年前,妈妈的年龄是女儿的5倍.
(2)用0、1、2、3、4这5个数字,能组成的没有重复数字的三位数有:
102,103,104,120,130,140,123,124,132,134,142,143,201,203,204,210,230,240,213,214,231,234,241,243,301,302,304,310,320,340.312,314,321,324,341,342,401,402,403,410,420,430,412,413,421,423,431,432,一共48个;
其中偶数有:102,104,120,130,124,132,134,142,140,142,210,230,240,214,234,302,304,310,320,340,312,314,324,342,402,410,420,430,412,432,一共30个;
答:能组成48个没有重复数字的三位数;其中偶数共有30个.
=32÷2-11,
=16-11,
=5(年);
答:5年后,妈妈的年龄是女儿的3倍.
11-(43-11)÷(5-1),
=11-32÷4,
=11-8,
=3(年);
答:3年前,妈妈的年龄是女儿的5倍.
(2)用0、1、2、3、4这5个数字,能组成的没有重复数字的三位数有:
102,103,104,120,130,140,123,124,132,134,142,143,201,203,204,210,230,240,213,214,231,234,241,243,301,302,304,310,320,340.312,314,321,324,341,342,401,402,403,410,420,430,412,413,421,423,431,432,一共48个;
其中偶数有:102,104,120,130,124,132,134,142,140,142,210,230,240,214,234,302,304,310,320,340,312,314,324,342,402,410,420,430,412,432,一共30个;
答:能组成48个没有重复数字的三位数;其中偶数共有30个.
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解:(1)(43-11)÷(3-1)-11,
=32÷2-11,
=16-11,
=5(年);
答:5年后,妈妈的年龄是女儿的3倍.
11-(43-11)÷(5-1),
=11-32÷4,
=11-8,
=3(年);
答:3年前,妈妈的年龄是女儿的5倍.
(2)用0、1、2、3、4这5个数字,能组成的没有重复数字的三位数有:
102,103,104,120,130,140,123,124,132,134,142,143,201,203,204,210,230,240,213,214,231,234,241,243,301,302,304,310,320,340.312,314,321,324,341,342,401,402,403,410,420,430,412,413,421,423,431,432,一共48个;
其中偶数有:102,104,120,130,124,132,134,142,140,142,210,230,240,214,234,302,304,310,320,340,312,314,324,342,402,410,420,430,412,432,一共30个;
答:能组成48个没有重复数字的三位数;其中偶数共有30个.
=32÷2-11,
=16-11,
=5(年);
答:5年后,妈妈的年龄是女儿的3倍.
11-(43-11)÷(5-1),
=11-32÷4,
=11-8,
=3(年);
答:3年前,妈妈的年龄是女儿的5倍.
(2)用0、1、2、3、4这5个数字,能组成的没有重复数字的三位数有:
102,103,104,120,130,140,123,124,132,134,142,143,201,203,204,210,230,240,213,214,231,234,241,243,301,302,304,310,320,340.312,314,321,324,341,342,401,402,403,410,420,430,412,413,421,423,431,432,一共48个;
其中偶数有:102,104,120,130,124,132,134,142,140,142,210,230,240,214,234,302,304,310,320,340,312,314,324,342,402,410,420,430,412,432,一共30个;
答:能组成48个没有重复数字的三位数;其中偶数共有30个.
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