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3-Find the error in each of the following, and correct it:
(1) -13 + ( - 4 ) = 1 7
(2) -3 + ( - 5 ) = - 2
(3) 9 + ( - 1 2 ) = 2 1
4- Find the result:
(1) 15 + ( - 3 ) = ............. (4) -3X 7 = .............. .
(2) 6 + ( - 4 ) = .............. (5) -72+ ( - 9 ) = ............
(3) 7 ÷ ( - 7 ) = ............. (6) 420 + ( - 1 5 ) = .........
5-Find the result of each of the following
(a) (-4) x [4 + (-1)]
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