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Đáp án:
`32cm^2`
Giải thích các bước giải:
Diện tích tam giác `ADN` là:
`(2`x`4):2=4 (cm^2)`
Diện tích tam giác `BMC` là:
`(4`x`6):2=12 (cm^2)`
Diện tích hình vuông `ABMN` là:
`4`x`4=16 (cm^2)`
Diện tích hình thang `ABCD` là:
`4+12+16=32 (cm^2)`
Đáp số: `32cm^2 `
Vì `ABMN` là hình vuông
`⇒ AB=BM=MN=NA=4\ cm`
Ta có: `DN+NM+MC=DC`
`DC=2+4+6=12\ cm`
`S_{ABCD}=\frac{1}{2}.(AB+DC).AN`
`S_{ABCD}=\frac{1}{2}.(4+12).4=32\ (cm^2)`
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Bài 15. P = (x/(x²-4) + 2/(2-x) + 1/(x+2)) : 1/(x+2) a.Rút gọn P , b.Tính giá trị của P khi x =-2000 c.Tìm x để P có giá trị là 1/19 d.Tìm x để P < 0 e.Tìm x nguyên để P có giá trị nguyên Bài 16. Q = (x/(3x-9) + (2x-3)/(3x-x²)) * (3x^2-9x)/(x2-6x+9) a.Rút gọn Q b.Tính giá trị của Q khi x= -4 c.Tìm x để Q=-2 d.Tìm x để Q > 0 e.Tìm x nguyên để Q có giá trị nguyên
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Viết chữ tình bn 1 thu anh có chữ ký 1 tranh ko
Trả lời hộ mk bài 4,5 phần tự luận
TÌm STN n nhỏ hơn hoặc bằng 10 để 5/n+7 là P/S tối giản
Làm thơ với chủ đề tình bạn. Yêu cầu: - Là 1 bài thơ hoàn chỉnh - Không chép mạng
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