a: \(\left(-23,57\right)\cdot\left(-28,17\right)-28,17\cdot123,57\)
\(=23,57\cdot28,17-28,17\cdot123,57\)
\(=28,17\left(23,57-123,57\right)\)
\(=28,17\cdot\left(-100\right)=-2817\)
b: \(60,7+25,5-38,7\)
=25,5+60,7-38,7
=25,5+22
=47,5
c: \(\left(-9,207\right)+3,8+\left(-1,503\right)-2,8\)
\(=\left(-9,207-1,503\right)+\left(3,8-2,8\right)\)
=-10,71+1
=-9,71
d: \(\left(-12,5\right)+17,55+\left(-3,5\right)-\left(-2,45\right)\)
\(=\left(-12,5-3,5\right)+17,55+2,45\)
=-16+20
=4
e: \(2,07+\left(-7,36\right)-\left(-8,97\right)+1,03-7,64\)
\(=\left(2,07-7,36-7,64\right)+\left(8,97+1,03\right)\)
=10-12,93
=-2,93
f: \(\left(2,07+3,005\right)-\left(12,005-4,23\right)\)
\(=2,07+3,005-12,005+4,23\)
=6,3-9
=-2,7
g: \(4,35-\left(2,67-1,65\right)+\left(3,54-6,33\right)\)
\(=4,35-2,67+1,65+3,54-6,33\)
=6-9+3,54
=3,54-3
=0,54
h: \(\left(-0,4\right)\cdot\left(-0,5\right)\cdot\left(-0,8\right)\)
\(=-0,4\cdot0,5\cdot0,8\)
\(=-0,4\cdot0,4=-0,16\)
