6年級數學(方程)

2007-06-14 2:52 am

4m+5=7m-7

m=????

回答 (8)

2007-06-14 2:56 am

✔ 最佳答案

4m+5=7m-7
5 + 7 = 7m – 4m
12 = 3m
m = 4

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2007-06-15 10:01 pm

4m+5=7m-7
-3m=-12
m=4

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2007-06-15 3:55 am

3m4m+5=7m-7
4m+5+7=7m-7+7
12+4m-4m=7m-4m
3m=12
m=4 =

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2007-06-14 3:26 am

4m + 5=7m - 7
5+7=7m-4m
12=3m
3m=12
m=12/3
m=4

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2007-06-14 3:16 am

4m+5=7m-7
4m+5+7=7m
4m+12=7m
大家都知道，4m+3m=7m
宜加就係: 4m+12=7m
即係3m=12
m=12/3
m=4

所以m=4

參考: me

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2007-06-14 3:00 am

7m-7+7=4m+5+7
7m=4m+12
4m+12-4m=7m-4m
3m=12
m=4

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2007-06-14 2:59 am

我諗係咁:
4m+5=7m-7

7m – 4m = 5 + 7

3m = 12

m = 4

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2007-06-14 2:58 am

4m+5=7m-7
4m+5+7=7m-7+7 (兩邊同時加7)
12+4m-4m=7m-4m (兩邊同時減4m)
3m=12
m=4

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