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a)|5-3x|=4
5-3x=4 lub 5-3x=-4
-3x=-1 -3x=-9
x=1/3 lub x=3
b)1\2x-1-(x+1)²=(1-x)(1+x)
1/2x-1-x²-1-2x=1-x²
-1,5x=3
x=-2
c)4x²=5x
4x²-5x=0
x(4x-5)=0
x=0 lub 4x-5=0
4x=5
x=1,25
d)3x²-7x-6=0
∆=(-7)²-4*(-6)*3=49+72=121
pierwiastek z ∆=11
x1=(7-11)/6=-4/6=-2/3
x2=(7+11)/6=18/6=3
2.
a)5x+2-4(2x-1)≥-3
5x+2-8x+4≥3
-3x≥-3
x≤1
x∈(-∞,1>
b)(x-3)(x+3)-(x-2)²<19
x²-9-x²-4+2x<19
2x<32
x<16
x∈(-∞,16)