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2. -10x4= -40
3. 1+(2+(-5))=1+(-3)=-2
4. -2+(3+4)=-2+7=5
5. 3x(63+17)=3x80=240
6. -5x(21+19)=-5x40=-200
2) -10×4= -40
3) 1+(2+(-5))= -4
4) -2+(3+4)= -5