Toán Lớp 6: 28*75+25*28+1200
(5*x-25):4=25
3^x+1 -12=69
Mot manh dat hinh chu nhat co chieu rong bang 40m chieu dai gap doi chieu rong.Hay tinh chu vi va dien tich cua manh dat do
So sanh 3^1234 va 2^1851
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