42*75%+3/4*59-0.75
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42*75%+3/4*59-0.7542*75%+3/4*59-0.7542*75%+3/4*59-0.7542*75%+3/4*59-0.75=42*0.75+0.75*59-0.75=（42+59
42*75%+3/4*59-0.75
42*75%+3/4*59-0.75
42*75%+3/4*59-0.75
42*75%+3/4*59-0.75
=42*0.75+0.75*59-0.75
=（42+59-1）*0.75
=100*0.75
=75
75
3/4(42+59-1)=75
原式=（42+59-1）×0.75
=75
(42+59-1)X0,75=75
(42*0.75)+[(3/4)*59]-0.75 =75
42*75%+3/4*59-0.75
=42*0.75+0.75*59-0.75
=(42+58+2)*0.75-0.75
=75+0.75
=75.75
42*75%+3/4*59-0.75
=(42*0.75)+(0.75*59)-0.75
=75
=（42+59-1）*3/4
=75
42*75%+3/4*59-0.75
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