cho x,y là số thực dương thỏa mãn x^3+y^3=xy-1/27
tính giá trị của biểu thức P=(x+y+1/3)^3-3/2(x+y)+2018
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Diện tích trồng rau chiếm:
\(1-\frac{4}{10}-\frac{5}{10}=\frac{1}{10}\)(diện tích khu đất)
Diện tích trồng rau là:
2 x 1/10 = 0,2 (ha) = 2000 m2
Đ/s: 2000 m2
đổi 2ha=20000 m vuông
tổng diện tích khu đất trồng là
4/10+5/10=9/10(khu đất)
diện tích đất trồng rau là:
1-9/10=1/10(khu đất)
diện tích đất trồng rau là:
20000*1/10=2000 m vuông
đấp số:vậy dt đất trông rau là:2000 m vuông
2xy-y+4x=14
y(2x+1)+4x+2=16
y(2x+1)+2(2x+1)=16
(y+2)(2x+1)=16=1.16=16.1=2.8=8.2=4.4
Đến đây bạn tự lập bảng, còn lại dễ mà:))
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