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1) 2ab²+3bc-b
=2((-2)(-3))²+3((-3)(-4))-(-3)
= 72+36+3 =111
2) ab²-3bc+4ab
=36-36+24 = 24
3) 3ab-2b²c-4ac
=18+72-32 =58
4) 2ab²c-2ab²+2ac
=144+36+16 =196
5) 3a²b²c-2ab-3ac
=-432-12-24 =-468
= 2(-2)(9) + 3(12) + 3
= 2 (-18) + 36 + 3
= -36 + 36 + 3
= 3
2) ab²-3bc+4ab = (-2)(-3)² - 3(-3)(-4) + 4(-2)(-3)
= (-2)(9) - 3(12) + 4(6)
= -18-36+24
= -54+24
= -30
3) 3ab-2b²c-4ac = 3(-2)(-3) - 2(-3)²(-4) - 4(-2)(-4)
= 3(6) - 2(9)(-4) -4(8)
= 18-2(-36)-32
= 18+72-32
= 58
4) 2ab²c-2ab²+2ac = 2(-2)(-3)²(-4) - 2(-2)(-3)² + 2(-2)(-4)
= 2(-2)(9)(-4) - 2(-2)(9) + 2(8)
= 144+36+16
= 196
5) 3a²b²c-2ab-3ac = 3(-2)²(-3)²(-4) - 2(-2)(-3) - 3(-2)(-4)
= 3(4)(9)(-4) -2(6)-3(8)
= -432-12-24
= -468