数学有几道题,不会呀,教一下.❶已知:a+b=40.1 b+c=51.4 a+c=28.5求a,b,c格是多少.❷在下列算式中填上0〜9这是个数字,不能重复. (?)(?).(?)(?)(?) ➖(?)(?).(?)(?)(?)_________________
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![数学有几道题,不会呀,教一下.❶已知:a+b=40.1 b+c=51.4 a+c=28.5求a,b,c格是多少.❷在下列算式中填上0〜9这是个数字,不能重复. (?)(?).(?)(?)(?) ➖(?)(?).(?)(?)(?)_________________](/uploads/image/z/4353368-32-8.jpg?t=%E6%95%B0%E5%AD%A6%E6%9C%89%E5%87%A0%E9%81%93%E9%A2%98%2C%E4%B8%8D%E4%BC%9A%E5%91%80%2C%E6%95%99%E4%B8%80%E4%B8%8B.%26%2310102%3B%E5%B7%B2%E7%9F%A5%EF%BC%9Aa%2Bb%3D40.1++b%2Bc%3D51.4++++a%2Bc%3D28.5%E6%B1%82a%2Cb%2Cc%E6%A0%BC%E6%98%AF%E5%A4%9A%E5%B0%91.%26%2310103%3B%E5%9C%A8%E4%B8%8B%E5%88%97%E7%AE%97%E5%BC%8F%E4%B8%AD%E5%A1%AB%E4%B8%8A0%26%2312316%3B9%E8%BF%99%E6%98%AF%E4%B8%AA%E6%95%B0%E5%AD%97%2C%E4%B8%8D%E8%83%BD%E9%87%8D%E5%A4%8D.++++++++++%28%3F%29%28%3F%29.%28%3F%29%28%3F%29%28%3F%29+++++%26%2310134%3B%28%3F%29%28%3F%29.%28%3F%29%28%3F%29%28%3F%29_________________)
数学有几道题,不会呀,教一下.❶已知:a+b=40.1 b+c=51.4 a+c=28.5求a,b,c格是多少.❷在下列算式中填上0〜9这是个数字,不能重复. (?)(?).(?)(?)(?) ➖(?)(?).(?)(?)(?)_________________
数学有几道题,不会呀,教一下.
❶已知:a+b=40.1 b+c=51.4 a+c=28.5
求a,b,c格是多少.
❷在下列算式中填上0〜9这是个数字,不能重复.
(?)(?).(?)(?)(?)
➖(?)(?).(?)(?)(?)
__________________
1 . 9 7 6
❸巧算:1➖0.1➖0.01➖0.001➖0.0001(请脱式计算)
有三题
数学有几道题,不会呀,教一下.❶已知:a+b=40.1 b+c=51.4 a+c=28.5求a,b,c格是多少.❷在下列算式中填上0〜9这是个数字,不能重复. (?)(?).(?)(?)(?) ➖(?)(?).(?)(?)(?)_________________
40.1+51.4+28.5=120
120=2(a+b+c)
a+b+c=60
a=8.6
b=31.5
c=19.9
第二题你确定没错?
3.8*0.52=1.976 - -0
1·0.1·0.01·0.001·0.0001
=0.1·0.01·0.001.0.0001
=0.001·0.001·0.0001
=0.00001·0.0001
=0.00000001
a=40.1-b c=51.4-b 40.1-b+51.4-b=28.5 所以b=31.5 a=8.6 c=19.9
1,
[(a+b)+(a+c)-(b+c)]\2
得a,即可求得b,c
1,(a+b)-(a+c)=40.1-28.5得b-c=11.6
(b+c)-(b-c)=51.4-11.6得2c=39.8 c=19.9 b=31.5 a=8.6
第二题真心不会
3第一个空填“÷”中间两个填“x”最后填=
你想干嘛.都是符号要我做什么?
(a+b)+(b+c)-(a+c)=2b
(a+b)+(a+c)-(b+c)=2a
(b+c)+(a+c)-(a+b)=2ca+b=40.1 a=40.1-b
b+c=51.4 b=51.4-c
a+c=28.5 a=28.5-c
a=40.1-b=28.5-c
40.1-(51.4-c)=28.5-c
40.1-51...
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(a+b)+(b+c)-(a+c)=2b
(a+b)+(a+c)-(b+c)=2a
(b+c)+(a+c)-(a+b)=2ca+b=40.1 a=40.1-b
b+c=51.4 b=51.4-c
a+c=28.5 a=28.5-c
a=40.1-b=28.5-c
40.1-(51.4-c)=28.5-c
40.1-51.4+c=28.5-c
c+c=28.5-40.1+51.4
2c=39.8
c=19.9
b+19.9=51.4
b=51.4-19.9
b=31.5
a+31.5=40.1
a=40.1-31.5
a=8.6
收起
c比a多:51.4-40.1=11.3 a+c=28.5,可以用和差问题来解答 求c= (28.5+11.3)÷2=19.9 &...
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c比a多:51.4-40.1=11.3 a+c=28.5,可以用和差问题来解答 求c= (28.5+11.3)÷2=19.9 a=28.5-19.9=8.6 b=40.1-8.6=31.5
收起
第一题考的是三元一次方程组的求解,自己算
1×0.1÷0.01=0.001÷0.0001