= 0,6 : 5/4 + 1/4 + 2/9 : 5/9  - 1/4

 = 3/5 . 4/5  + 2/9 . 9/5

= 12/25  + 2/5

= 22/25

a) \(C=3\cdot\sqrt{25}-3\cdot\sqrt{\frac{1}{9}}\)

\(C=3\cdot5-3\cdot\frac{1}{3}\)

\(C=15-1=14\)

b) \(D=-4\sqrt{\frac{4}{25}}+3\sqrt{0,16}-2\sqrt{0,04}\)

\(D=-4\cdot\frac{2}{5}+3\cdot\frac{2}{5}-2\cdot\frac{1}{5}\)

\(D=\frac{1}{5}\cdot\left(-8+6-2\right)\)

\(D=\frac{1}{5}\cdot\left(-4\right)=-\frac{4}{5}\)

1> Nua chu vi khu dat hinh chu nhat la:

 280:2=140(m)

 Goi chieu dai va chieu rong lan luot la x,y(x,y \(\varepsilon\)N)

Theo bai ra ta co : \(\frac{x}{4}=\frac{y}{3}\)va x+y=140

Ap dung tinh chat day ti so bang nhau ta co:

   \(\frac{x}{4}=\frac{y}{3}=\frac{x+y}{4+3}=\frac{140}{7}=20\)

Tu \(\frac{x}{4}=20=>x=80\)

       \(\frac{y}{3}=20=>y=60\)

Vaay chieu dai va chieu rong lan luot la 80,60

             Dien h khu dat hinh chu nhat la 

                          80.60=4800(\(m^2\))

                                    D/s:4800m^2

Day la cach lam lop 7 nha boi vi ban hocj lop 7 nen mk giai theo cach lop7.

Nho k cho mk nhe

a) \(2\sqrt{9}+3\sqrt{16}+2\sqrt{49}\)

\(=2.3+3.4+2.7\)

\(=6+12+14\)

\(=32\)

b) \(4\sqrt{0,25}+2\sqrt{0,36}-2\sqrt{0,16}\)

\(=4.\sqrt{\frac{25}{100}}+2\sqrt{\frac{36}{100}}-2\sqrt{\frac{16}{100}}\)

\(=4.\frac{1}{2}+2.\frac{3}{5}-2.\frac{4}{25}\)

\(=2+\frac{6}{5}-\frac{8}{25}\)

\(=\frac{72}{25}\)

a) = \(\frac{7}{2}\)

b) = \(\frac{643}{64}\)

c) = 0

a: \(=4\cdot5+14:7\)

=20+2

=22

a) \(\sqrt{0,09}-\sqrt{0,64}=\frac{-1}{2}=-0,5\)

b) \(0,1\cdot\sqrt{225}-\sqrt{\frac{1}{4}}=0,1\cdot15-\frac{1}{2}=1\)

c) \(\sqrt{0,36}\cdot\sqrt{\frac{25}{16}+\frac{1}{4}}=\frac{3\sqrt{29}}{20}\)

d) đề baì có sai ko ban?

1. a) 3+2=5

b) 0,5-0,1=0,4

c) 4/5-1/9=31/45

d) 2-0,6=1,4

2. a) 8-4+3=7

b) 11+5-3=13

c) 3/2-4/6-7-37/6

d) 4+5-6=3

Mơn nhìu <3