56×72=79 ,32×4=81,9×12=34,15×18=56,49×49=?
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as 56= 7×8, 72= 8×9 anwer is 79
32= 8×4 ,4=4×1, anwer is 81
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49=7×7 ,49=7×7 anwer is 77
32= 8×4 ,4=4×1, anwer is 81
comman removed
49=7×7 ,49=7×7 anwer is 77
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