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1.a(3c-b)
=3{3×6-(-5)}
=3(18+5)
=3×23
=69
2.ab²-ac
=3(-5)² - 3×6
=3×25-18
=75-18
=57
3.b/a-c/b
=-5/3-6/-5
=-25-18/-15
=25+18/-15
=43/-15
4.b+c/a+a+c/b
=-5+6/3 + 3+6/-5
=1/3 + 9/-5
=-15 + 27 /-15
=12/-15
=4/-5
=3{3×6-(-5)}
=3(18+5)
=3×23
=69
2.ab²-ac
=3(-5)² - 3×6
=3×25-18
=75-18
=57
3.b/a-c/b
=-5/3-6/-5
=-25-18/-15
=25+18/-15
=43/-15
4.b+c/a+a+c/b
=-5+6/3 + 3+6/-5
=1/3 + 9/-5
=-15 + 27 /-15
=12/-15
=4/-5
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