1. а). 2(-4)+(-5)(-3)=-8+15=7
б). (-6-4)•(-7+3)=-24*(-4)=96
2. (2/3)x =-8
x=-8/(2/3)
x=-12
3. при x=-3 4x+1=4*(-3)+1=-11
при x=-3 x²=(-3)²=9
4. -1/7+(-3.5+4.9)=1.4-(1/7)=1 2/5 -1/7=1 14/35 -5/35=1 9/35
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Answers & Comments
1. а). 2(-4)+(-5)(-3)=-8+15=7
б). (-6-4)•(-7+3)=-24*(-4)=96
2. (2/3)x =-8
x=-8/(2/3)
x=-12
3. при x=-3 4x+1=4*(-3)+1=-11
при x=-3 x²=(-3)²=9
4. -1/7+(-3.5+4.9)=1.4-(1/7)=1 2/5 -1/7=1 14/35 -5/35=1 9/35