1.
1) 0.747 - 2.65=-1.903
2) 2.5*(-0.04)=-0.1
3)c^2*(c^5)^2=c^12
4) не видно
5) 2.43=-13.3-(-15.73)
2.
1) (238.091 - 247.191) - 1238.091=1000-247.191=752.809
2)243.87^2-143.87^2=(243.87-143.87)(243.87+143.87)=100*387.74=38774
3)()37.9^2-7.7^2) / (37.9-7.7) -7.7=((37.9-7.7)(37.9+7.7))/(37.9-7.7)-7.7=37.9
4) (16.37^2-2*16.37*7.77+7.77^2)/8.6=(16.37-7.77)^2/8.6=8.6^2/8.6=8.6
5)34.96^2+2*34.96*2.52= 34.96^2+2*34.96*2.52+2.52^2-2.52^2=(34.96+2.52)^2-2.52^2=37.48^2-2.52^2=(37.48-2.52)(37.48+2.52)=34.96*40=1400-1.6=1398.4
6)(36+18/5-36/35)*5/18=10+1-2/7=11-2/7=75/7=10 5/7
3.
1) 2/3 = 1.2
2)3/2=2.7
3)0.25, x=300
4)7/60, x=140
4.
1) (2x-5)/5 -0.5x=7 | *10
4x-10-5x=70
- x=80
x=-80
2)(-1-a)*(2a-3)=0
- 1-a=0 или 2a-3=0
a=-1 a=1.5
3)2c-3c^2=0
c(2-3c)=0
c=0 или 2-3c=0
c=2/3
4)(2-3c)^2=0
2-3c=0
c=2/3
5)(3a+2)*3a-(3a-1)(3a+1)=5
9a^2+6a-9a^2+1=5
6a=4
a=2/3