Giúp mik , mik sẽ kickkkkkkkkkkkkkkkk :((((( Cần gấp :((((
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sau 2 giờ ô tô đi đc số phần quãng đường là:
1/4+1/6=5/12(quãng đường)
đs:........
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Lớp 4B trông đc số cây là:
80 : 5 x 4 = 64 ( cây)
Lớp 4C trồng được số cây là:
64 + 12 = 76 (cây)
Cả khối trồng được số cây là:
80 + 64 + 76 = 220 (cây)
Đ/s:..
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11)\(\dfrac{3x+1}{x-5}+\dfrac{2x}{x-5}=\dfrac{3x+2x+1}{x-5}=\dfrac{5x+1}{x-5}\)
12)\(\dfrac{4-x^2}{x-3}+\dfrac{2}{x^2-9}=\dfrac{4-x^2}{x-3}+\dfrac{2}{\left(x-3\right)\left(x+3\right)}=\dfrac{\left(4-x^2\right)\left(x+3\right)}{\left(x-3\right)\left(x+3\right)}+\dfrac{2}{\left(x-3\right)\left(x+3\right)}=\dfrac{2+\left(2-x\right)\left(2+x\right)\left(x+3\right)}{\left(x-3\right)\left(x+3\right)}\)
13)
\(\dfrac{3}{4x-2}+\dfrac{2x}{4x^2-1}=\dfrac{3}{2\left(2x-1\right)}+\dfrac{2x}{\left(2x-1\right)\left(2x+1\right)}=\dfrac{3\left(2x+1\right)}{2\left(2x-1\right)\left(2x+1\right)}+\dfrac{2.2x}{2\left(2x-1\right)\left(2x+1\right)}=\dfrac{6x+3+4x}{2\left(2x-1\right)\left(2x+1\right)}=\dfrac{10x+3}{2\left(2x-1\right)\left(2x+1\right)}\)
14)
\(\dfrac{2x+1}{2x-4}+\dfrac{5}{x^2-4}=\dfrac{2x+1}{2\left(x-2\right)}+\dfrac{5}{\left(x-2\right)\left(x+2\right)}=\dfrac{\left(2x+1\right)\left(x+2\right)}{2\left(x-2\right)\left(x+2\right)}+\dfrac{5.2}{2\left(x-2\right)\left(x+2\right)}=\dfrac{2x^2+5x+12}{2\left(x-2\right)\left(x+2\right)}\)
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1. more
2. more
3. more
4. more
5. more
6. less
7. more
8. less
9. more
10. less ; more
11. more
1more
2more
3more
4more
5more
6less
7more
8less
9more
10less and mỏe
11more
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1 - my school is bigger than your school 8 Nam is shorter than his sister
4 - this ruler is longer than that ruler
7 - my house is taller than your house
3 My father is oldder than my mother
4 This ruler is longger than that ruler
5 This room is larger than my room
LG
vì \(\widehat{A}\)và \(\widehat{B}\)là hai góc đồng vị
=>A=B mà A=\(90^0\)
=>B=\(90^0\)
vì D và C là hai góc trong cùng phía
=>D + C=\(180^0\) mà C = \(100^0\)
=>D=\(180^0-110^0=70^0\)
đây nhá bạn