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=-4bc -2ac -5ab -(2ab +3bc +4ac)
= -4bc -2ac -5ab -2ab -3bc -4ac
= -4bc -3bc -2ac -4ac -5ab-2ab
= -7bc -6ac -7ab
jawaban soal nomer 4
= 5n-7m+11mn +( 15mn-4m+2n)
= 5n-7m+11mn + 15mn-4m+2n
= 5n +2n -7m -4m +11mn +15mn
= 7n -11m + 26mn
jawabn soal nomer 5
= 2e-2f+3h -(8e-5f-9h)
= 2e -2f +3h -8e +5f +9h
= 2e -8e -2f +5f +3h +9h
= -6e + 3f + 12h