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Answer 1

4: \(=29\cdot19-29\cdot13-19\cdot29+19\cdot13=-10\cdot13=-130\)

5: \(=31\left(-18-81-1\right)=-31\cdot100=-3100\)

6: \(=-12\cdot\left(47+52+1\right)=-12\cdot100=-1200\)

7: \(=13\cdot45-3\cdot45=10\cdot45=450\)

8: \(=-48\left(1+78+21\right)=-48\cdot100=-4800\)