1)150:x=30
x=150:30
x=5
2)13·x=91
x=91:13
x=7
(2^4)^-0,75*(5²)^0,5+(2^4)^(-1/2)*(3²)^1,5-(10^-2)^-0,5=
=2^-3*5+2^-2*3³-10=1/8*5+1/4*27-10=5/8+27/4-10=
=(5+54-80)/8=-21/8=-2,625
4)
- 5 * (8.2) * ( - 1.5) = - 5 * (-( <u><em>8.2 * 1.5</em></u>) = - 5 * ( -12.3) = 61.5
5)
- 3 * ( -2) * ( -8.2) * (- 1.5) = - 3 * ( - 2) * ( <em>8.2 * 1.5</em>) = -3 * ( -2) * 12.3 = 6 * 12.3 = 73.8
6)
- 2 * ( -3) * (- 4) * ( -8.2) * ( -1.5) = - 2 * ( - 3) * ( -4) * ( <u>8.2 * 1.5</u>) = 6 * ( -4) * 12.3 =
= - 24 * 12.3 = - 295. 2
( минус * плюс = минус; минус * минус = плюс)