А) 5 - ( a - 3) = 5 - a + 3 = 8 - a
Б) 7 + ( 12 - 2b) = 7 + 12 - 2b = 19 - 2b
В) 64 - ( 14 - 7x) = 64 - 14 + 7x = 50 + 7x
Г) 38 + ( 12p - 8) = 38 + 12p - 8 = 30 + 12p = 6 ( 5 + 2p)
√128cos²3π/8-√32=8√2*(1+cos3π/4)/2-4√2=4√2*(1-cosπ/4)-4√2=
=4√2-4√2*1/√2-4√2=-4
2√125-0.5√20+9√45-6√5=2*5√5-0.5*2√5+9*3√5-6√5=10√5-√5+27√5-6√5=30√5
√11²-√2²=11-2=9
= -2sin(360+30) + 6* 1/2 + ctg(720+30) + 9*
= -2* 1/2 +3 +
+
= -1+3+
= 2+