a)175-y:35-30=110
175-y:30=110+30
175-y:30=140
y:30=175-140
y:30=35
y=35.30
y=1050
7/4-y.2/5+3/5=3/2
7/4-y.2/5=3/2-3/5
7/4-y.2/5=9/10
y.2/5=7/4-9/10
y.2/5=25/40
y=25/40 / 2/5
y=25/6
Thank you very much!
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Chúc bn hok tốt nha!
Ta có : a , 175 - y : 35 - 30 = 110 .
=> 175 - 30 - y : 35 = 110 .
=> 145 - y : 35 = 110 .
=> y : 35 = 145 - 110 .
=> y : 35 = 35 .
=> y = 352 .
=> y = 1225 .
b, 7/4 - y . 2/5 + 3/5 = 3/2 .
=> 7/4 - y . 2/5 = 3/2 - 3/5 .
=> 7/4 - y . 2/5 = 15/10 - 6/10 .
=> 7/4 - y . 2/5 = 9/10 .
=> y . 2/5 = 7/4 - 9/10 .
=> y . 2/5 = 35/20 - 18/20 .
=> y . 2/5 = 17/20 .
=> y = 17/20 : 2/5 .
=> y = 17/20 . 5/2 .
=> y = 17/8 .