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3(3)(-4)(-5)
180
b.4p+2q-3r
4(3)+2(-4)-3(-5)
12-8+15
19
c.2(p+q)+2(p-r)
2(3-4)+2(3-5)
2(-1)+2(-2)
-2-4
-6
d.5pq^-3r^^
5(3)(-4)^-3(-5)^^
5(3)(16)-3(-125)
240+375
615
b. 4p+2q-3r=4×3+2×-4-3×-5=12+(-8)+15=19