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a) \(17\cdot85+15\cdot17-120\)
\(=17\cdot\left(85+15\right)-120\)
\(=17\cdot100-120\)
\(=1700-120\)
\(=1580\)
b) \(27\cdot77+24\cdot27-27\)
\(=27\cdot\left(77+24-1\right)\)
\(=27\cdot100\)
\(=2700\)
7: \(\left(-2\right)+4-3=\left(-2-3\right)+4=-5+4=-1\)
8: \(\left(-6\right)+5+5=\left(-6\right)+\left(5+5\right)=10-6=4\)
9: \(\left(-2\right)+7+1=\left(-2\right)+\left(7+1\right)=8-2=6\)
10: \(\left(-4\right)+14-10\)
\(=\left(-4-10\right)+14\)
=14-14
=0
11: \(\left(-7\right)+5+2\)
\(=\left(-7\right)+\left(5+2\right)\)
=7-7
=0
12: \(\left(-6\right)+4+2\)
\(=\left(-6\right)+\left(4+2\right)\)
=-6+6
=0
a)=-7/21+8/24
=-1/3+1/3
=0
b)=-3/5.(2/7+5/7)+23/5
=-3/5.7/7+23/5
=-3/5.1+23/5
=-3/5+23/5
=20/5=4
c)=75/100-11/2+5/10:5/12+1/4
=3/4-11/2+1/2:5/12+1/4
=3/4+-11/2+1/2.12/5+1/4
=3/4+-22/4+6/5+1/4
=-19/4+6/5+1/4
=(-19/4+1/4)+6/5
=-18/4+6/5
=-9/2+6/5
=-45/10+12/10
=-23/10
( -4 )2- 15 . ( -6 ) - ( - 17 ) + 3
= 16 - (- 90 ) + 17 + 3
= 106 + 20
= 126
a) \(17+188+183=205+183=388\)
b) \(80-\left[130-\left(12-4\right)^2\right]\)
\(=80-\left(130-64\right)\)
\(80-66=14\)
c) \(2^3.17-2^3.14\)
\(8.17-8.14\)
\(=8.\left(17-14\right)\)
\(=8.3=24\)