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Step-by-step explanation:
1.(iv) 4/-15 + -7/-15
= 4+(-7)/-15
= 4 -7/-15
= -3/-15
= -1/-5
1.(ii) -4/9 + 2/9
= -4+2/9
= -2/9
1.(v) -7/25 + 9/-25
= -7+9/-25
= 2/-25
2.(iv) -5/9 + 7/18
= LCM of 9 and 18 =18
= -10/18 + 7/18
= -10+7/18
= -3/18
= -1/6
2.(iii) -3 + 2/3
= LCM of 1 and 3= 3
= -9/3+2/3
= -9+2/3
= -7/3
2.(iv) -5/9 + 7/18
= LCM of 9 and 18= 18
= -10/18 + 7/18
= -10+7/18
= -3/18
= -1/6
2.(vi) 1/-18 + 5/-27
= LCM of -18 and -27 = 54
= 3/54 + 10/54
= 3+10/54
= 13/54
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