10*1/10+[4-{7/10+(1/5+1/4)}]
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Step-by-step explanation:
10×1/10+[4-{7/10+(1/5+1/4)}]
= 1+[4-{7/10+(4+5)/20}]
=1+[4-{7/10+9/20}]
=1+[4-{(14+9)/20}]
=1+[4-23/20]
=1+[(80-23)/20]
=1+57/20
=(20+57)/20
=77/20
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