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Matrix Addition and Subtraction calculator
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1. `A=[[3,1,1],[-1,2,1],[1,1,1]]` and `B=[[5,0,-2],[7,-6,0],[1,1,2]]`. Find A + B
2. `A=[[0,1,2],[5,7,6],[0,5,6]]` and `B=[[3,1,1],[-1,2,1],[1,1,1]]`. Find B - A
3. `A=[[2,1,-1],[1,0,-1],[1,1,2]]` and `B=[[5,0,-2],[7,-6,0],[1,1,2]]`. Find 3A
4. `A=[[0,1,2],[5,7,6],[0,5,6]]` and `B=[[2,1,-1],[1,0,-1],[1,1,2]]`. Find 3 A + 2 B
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Example1. Find `A + B` ... `A=[[3,1,1],[-1,2,1],[1,1,1]]`,`B=[[5,0,-2],[7,-6,0],[1,1,2]]`Solution:`A + B` | = | | `3` | `1` | `1` | | | `-1` | `2` | `1` | | | `1` | `1` | `1` | |
| + | | `5` | `0` | `-2` | | | `7` | `-6` | `0` | | | `1` | `1` | `2` | |
| = | | `8` | `1` | `-1` | | | `6` | `-4` | `1` | | | `2` | `2` | `3` | |
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