1.(0.3-x)(100*x/0.1+500)=120 100x^2+20x-3=0(10x-1)(10x+3)=0x1=0.1 x2=0.32.15(1+x)^2=21.6(1+x)^2-1.44=0(x+1-1.2)(x+1+1.2)=0x1=0.2 x2=-2.23.(1-x)(1+2x)-1.12=02x^2-x+0.12=0(2x-0.4)(x-0.3)=0x1=0.2 x2=0.34.(1+x)^2-1.44=0(1+x+1.2)(1+x-1.2)=0x1=-2.2 x2=0.2
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