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\(1,\dfrac{8}{13}+\dfrac{5}{13}=\dfrac{8+5}{13}=\dfrac{13}{13}=1\)
\(2,\dfrac{-8}{7}+\dfrac{-6}{7}=\dfrac{\left(-8\right)+\left(-6\right)}{7}=\dfrac{-14}{7}=-2\)
\(5,\dfrac{7}{-9}-\dfrac{13}{9}=\dfrac{\left(-7\right)-13}{9}=\dfrac{-20}{9}\)
\(6,\dfrac{5}{7}-\dfrac{-3}{21}=\dfrac{15}{21}-\dfrac{-3}{21}=\dfrac{15-\left(-3\right)}{21}=\dfrac{18}{21}=\dfrac{6}{7}\)
\(9,\dfrac{7}{-10}-\dfrac{2}{-15}=\dfrac{-105}{150}-\dfrac{-20}{150}=\dfrac{-\left(105-20\right)}{150}=\dfrac{-85}{150}\)
\(10,\dfrac{6}{13}-\dfrac{-15}{39}=\dfrac{18}{39}-\dfrac{-15}{39}=\dfrac{18-\left(-15\right)}{39}=\dfrac{33}{39}=\dfrac{11}{13}\)
1) \(\dfrac{8}{13}+\dfrac{5}{13}=\dfrac{13}{13}=1\)
2 ) \(\dfrac{-8}{7}+\dfrac{-6}{7}=\dfrac{-14}{7}=-2\)
3 ) \(\dfrac{-4}{3}-\dfrac{-7}{3}\)\(=\dfrac{3}{3}=1\)
4 ) \(\dfrac{-8}{5}+\dfrac{6}{-5}=\dfrac{-8}{5}+\dfrac{-6}{5}\)\(=\dfrac{-14}{5}\)
5 ) \(\dfrac{7}{-9}-\dfrac{13}{9}=\dfrac{-7}{9}-\dfrac{13}{9}=\dfrac{-20}{9}\)
6 ) \(\dfrac{5}{7}-\dfrac{-3}{21}=\dfrac{5\times3}{7\times3}=\dfrac{15}{21}-\dfrac{-3}{21}=\dfrac{18}{21}\)\(=\dfrac{6}{7}\)
Đợi
My father doesn't iced tea
Does my father iced tea
Dễ lắm, bn làm tương tự nha
1.pd : My father doesn't iced tea.
nv : Does your father iced tea ?
2.pd : The girl doesn't want some sandwiches.
nv : Does the girl want some sandwiches ?
MÌnh làm cho bạn 2 câu thôi.Còn lại bạn tự làm đi nhá!Mấy câu sau cũng làm tương tự như vậy thôi à.
\(1+2-3-4+5+...+994-995-996+997+998\)
\(=1+\left(2-3-4+5\right)+...+\left(994-995-996+997\right)+998\)
\(=1+0+...+0+998=999\)
Chúc bạn học tốt!!!
1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + .........+ 994 - 995 - 996 + 997 + 998
= 1 + ( 2 - 3 - 4 + 5 ) + ... + ( 994 - 995 - 996 + 997 ) + 998
= 1 + 0 + ... + 0 + 998 = 999
#ĐinhBa
a: UM=AU=2,5/2=1,25cm
VA=VE=AE/2=1,25cm
b: UV=1,25+1,25=2,5cm
=> 2^x-1 = 40-8 = 32 = 2^5
=> x-1 = 5
=> x = 5+1 = 6
k mk nha
1: Does he cold drink?
2: We are going to Nha Trang this summer vacation.
3: How much milk does your mother want?
4: I will write a letter tomorrow.
1. Does he cold drink ?
2. We will visit Nha Trang this summer vacation.
3. How much milk does your mother want ?
4. I will write a letter tomorrow
Bài 8: Tìm số tự nhiên x, biết:
\(a)\)\(17.6^2-230\div x=589\)
\(17.36-230\div x=589\)
\(612-230\div x=589\)
\(230\div x=612-589\)
\(230\div x=23\)
\(x=230\div23\)
\(x=10\)
\(b)\)\(2^6+\left(5+x\right)=3^4\)
\(64+\left(5+x\right)=81\)
\(\left(5+x\right)=81-64\)
\(5+x=17\)
\(x=12\)
cây c và d