1).4 2/5=22/5.
1 2/3=5/3.
5/3+5/8=40/24+15/24=55/24.
22/5 - 55/24=528/120 - 275/120=253/120=2 13/120.B.
2).72%=72/100÷2=36/50÷2=18/25.
18/25÷4/25=18/25×25/4=9/2.
1 1/9=10/9.
9/2×10/9=90/18=45/9=5/1=5.D.
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1).4 2/5=22/5.
1 2/3=5/3.
5/3+5/8=40/24+15/24=55/24.
22/5 - 55/24=528/120 - 275/120=253/120=2 13/120.B.
2).72%=72/100÷2=36/50÷2=18/25.
18/25÷4/25=18/25×25/4=9/2.
1 1/9=10/9.
9/2×10/9=90/18=45/9=5/1=5.D.