5)б)6a(0,3-0,6b)-3a(0,7a+0,8b)=0,3a²-3.6ab-2,4a
-0,3×-1²-3,6×(-1×1/6)-2,4×-1=2,7
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5)б)6a(0,3-0,6b)-3a(0,7a+0,8b)=0,3a²-3.6ab-2,4a
-0,3×-1²-3,6×(-1×1/6)-2,4×-1=2,7