1cyт=24ч=1440мин
3ч48мин=228 мин
9ч 56мин =596мин
1)1440 2) 1212
- 228 -596
1212мин 616мин
616мин=10ч 16 мин
55 Х 3 = 175
125 \% 5 = 25
25 Х 2 = 50ц= Это 1 день
∛(m³-6m²n+12mn²-8n³)/(2n-m)=∛(m³-3*m²*2n+3*m*(2n)²-(2n)²)/(2n-m)=
=∛(m-2n)³/(2n-m)=(m-2n)/(2n-m)=-(m-2n)/(m-2n)=-1.
log₄64-log₄(1/16)-3*log₄2=log₄2⁶-log₄2⁻⁴-log₄2³=log₄(2⁶/(2⁻⁴*2³)=
=log₄(2⁶/2⁻¹)=log₄2⁷=7*log₄2=7*log₂²2=(7/2)*log₂2=3,5.
(1/4)ˣ+(1/4)ˣ⁻¹>5
(1/4)ˣ+(1/4)ˣ/(1/4)>5
(1/4)ˣ+4/(1/x)>5
5*(1/4)ˣ>5 |÷5
(1/4)ˣ>1
(1/4)ˣ>(1/4)⁰
Так как (1/4)<0 ⇒
x<0.
1. 0,2 * (5/7 х - 1,2) = 3/7 х - 0,642. 0,4 * (1,3 + 5/9 х) = 7/9 х - 1,483. 7/20 : 3 х = 0,007 : 0,724. 0,375 : 1,04 = 3 11/13
LIT VLETU
<span>1. 0,2 * (5/7 х - 1,2) = 3/7 х - 0,64
1/7x - 0,24 = 3/7x - 0,64
0,4 = 2/7x
x = 0,4:2/7 = 0,4*7/2= 1,4
2. 0,4 * (1,3 + 5/9 х) = 7/9 х - 1,48
0,52 + 2/9x = 7/9x - 1,48
5/9x = 2
x = 2:5/9= 2 * 9/5 = 18/5 = 3 3/5
3. 7/20 : 3 х = 0,007 : 0,72
x = 7/20 : (7/100 : 72/100) = 7/20 : 7/72 = 7/20*72/7 = 72/20 = 3,6
4. 0,375 : 1,04 = 3 11/13 : 4 х
375/1000 : 104/100 = 375/1000* 100/104 = 75/208
4x = 3 11/13 : 75/208
4x = 50/13 : 75/208
4x = 50/13*208/75 = 32/3
x = 32/3:4 = 8/3 = 2 2/3
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