a) 1(1/4)+(2/5)=
b)5(3/4)+1(3/7)=
c)4(2/3)-2(1/7)=
d)7(1/10)-6(4/5)=
e 15' 5(1/3)=
f)2(1/3)' 1(5/7)=
g) 6(1/4):15=
h 4(2/7):2(2/9_=
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a] 5/4+2/5=25/20+8/20=33/20=1 i 13/20
b] 23/4+10/7=161/28+40/28=201/28=7i5/28
c] 14/3+15/7=98/21+45/21=143/21=6i17/21
d] 13 i 1/10+4/5=13i 1/10+8/10=13i 9/10
e]15*16/3=240/3=80
f] 2 i 1/3* 1i 5/7=7/3*12/7=12/3=4
g] 25/4:15=25/4*1/15=25/45=5/9
h]30/7:20/9=30/7*9/20=27/7
a)5/4+2/5=25/20+8/20=33/20=1 i 13/20
b)23/4+10/7=161/28+40/28=201/28=7i5/28
c)14/3+15/7=98/21+45/21=143/21=6i17/21
d)13 i 1/10+4/5=13i 1/10+8/10=13i 9/10
e)15*16/3=240/3=80
f)2i1/3* 1i 5/7=7/3*12/7=12/3=4
g)25/4:15=25/4*1/15=25/45=5/9
h)30/7:20/9=30/7*9/20=27/7=3 6/7