А)0.2^4/40=(1/5)^4/40=1^4/5^4/40=1^4/5^4*1/40=1/625*40=1/25000
б)1.8/(0.3)²=9/5/(3/10)²=9/5/1/3/(3/10)²=9*1/5*3²/10²=9/5*3²/10²=9*10²/5*3²=9*100/5*9=100/5=20
в)1/(-0.3)³=1/-3³/10=1/-3³/10³=1*(-10³/3³=-10³/3³=-1000/27=-37,03
г)1.6/(0.4)²=8/5/(2/5)²=8/5*1/(2/5)²=8*1/5*(2/5)²=8/5*2²/5²=8*5²/5*2²=8*5²/5*2²=8*25/5*4=200/20=10
-35x*(x+4)=(3-2x)*0.5
-35x-35x-140=4,5-3x
-70x+3x=140+4,5
-67x=144,5
X=144,5/(-67)
X=~-2,2
A)25%=25/100=1/4=0,25
б)1,25=1,25*100=125%
6. 2.1*6,3+2.1*3.7=2.1(6.3+3.7)= 2.1*10=21
16. 976
1) 72+44+810+46=976
2)75+52+870+58=1055