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=7*(-6)-5=-42-5=-47
2.
3.=[√(4*3)+√(9*3)+√(16*3)]:√3=(2√3+3√3+4√3):√3=9√3/√3
9√3/√3*√3/√3=(9*3)/3=27/3=9
4.w załączniku, wyższy to zbiór B
5.
500-0,2*500=500-100=400
400-0,2*400=400-80=320 zł