1.

18[19+{16-(15-2×8÷4+)}]​

Answer»

36−[18−{14−(15−4÷2×2)}]=36−[18−{14−(15− 24 ×2)}]=36−[18−{14−(15−2×2)}] =36−[18−{14−(15−4)}]=36−[18−{14−11}]=36−[18−3]=36−15=21



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