Bài 12: Tính chất của phép nhân
Các câu hỏi tương tự
Adfrac{1}{10}+dfrac{1}{11}+dfrac{1}{12}+...+dfrac{1}{99}+dfrac{1}{100}1
dfrac{2n+5}{n+2}
Sdfrac{1}{20}+dfrac{1}{21}+dfrac{1}{22}+L+dfrac{1}{29}
Adfrac{7}{4}.left(dfrac{3333}{1212}+dfrac{3333}{2020}+dfrac{3333}{3030}+dfrac{3333}{4242}right)
Adfrac{1}{4.5}+dfrac{1}{5.6}+...+dfrac{1}{48.49}+dfrac{1}{49.50}
Adfrac{17}{1.3}+dfrac{17}{3.5}+dfrac{17}{5.7}+...+dfrac{17}{49.51}
dfrac{2n+5}{3n+1}
left(left|xright|+dfrac{2}{5}right):dfrac{2}{5}1
dfrac{1}{2}+dfrac{1}{4}+dfrac{1}{8}+dfrac{1}{16}+dfra...
Đọc tiếp
\(A=\dfrac{1}{10}+\dfrac{1}{11}+\dfrac{1}{12}+...+\dfrac{1}{99}+\dfrac{1}{100}>1\)
\(\dfrac{2n+5}{n+2}\)
\(S=\dfrac{1}{20}+\dfrac{1}{21}+\dfrac{1}{22}+L+\dfrac{1}{29}\)
\(A=\dfrac{7}{4}.\left(\dfrac{3333}{1212}+\dfrac{3333}{2020}+\dfrac{3333}{3030}+\dfrac{3333}{4242}\right)\)
\(A=\dfrac{1}{4.5}+\dfrac{1}{5.6}+...+\dfrac{1}{48.49}+\dfrac{1}{49.50}\)
\(A=\dfrac{17}{1.3}+\dfrac{17}{3.5}+\dfrac{17}{5.7}+...+\dfrac{17}{49.51}\)
\(\dfrac{2n+5}{3n+1}\)
\(\left(\left|x\right|+\dfrac{2}{5}\right):\dfrac{2}{5}=1\)
\(\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{16}+\dfrac{1}{32}+\dfrac{1}{64}+\dfrac{1}{128}< 1\)
\(A=\dfrac{4}{1.3}+\dfrac{4}{3.5}+\dfrac{4}{5.7}+...+\dfrac{4}{99.101}\)
\(5.\left(\dfrac{1}{4}-\dfrac{1}{5}-\dfrac{1}{10}\right)\le\dfrac{x}{20}\le-3\left(\dfrac{1}{2}-\dfrac{1}{4}-\dfrac{1}{5}\right)\left(x\in Z\right)\)
\(\dfrac{2}{1.3}+\dfrac{2}{3.5}+\dfrac{2}{5.7}+...+\dfrac{2}{99.101}< 1\)
a)A=1/2.1/3+1/3.1/4+1/4.1/5+1/5.1/6+1/6.1/7+1/7.1/8+1/8.1/9
b)B=1/20+1/30+1/42+1/56+1/72+1/90+1/110
c)C=a.1/2-a.2/3+a.3/4 với a=-6/5
d)-1/6.b+4/3.b-1/2.b với b=-3/7
1. Cho (a-b) chia hết cho 6
Chứng tỏ rằng: a+5b; a-13b; a+17b chia hết cho 6
2. Tìm x,y thuộc Z, biết:
a) (x+3)(y+2)=1
b) (2x-5)(y-6)=17
c) (x-1)(x+y)=33
( 1+ 1/2 ) . ( 1+ 1/3 ) . ( 1+ 1/4 )
1/5 : 1/10 - 1/3 ( 6/5 - 9/4 )
-7/8 : 21/16 - 3/5 . ( 1/5 - 7/10 )
1.Tìm các cặp số nguyên (x,y)sao cho:
a,xy= -11
b, (-x).y=3
c,(x-1)(y+1)=5
d,(x+2)(3-y)= -3
5.Cho biểu thức A=|x-1|+3x-7
a,Rút gọn A
b,Tính A khi x=3;x= -5
Tìm x
a,(x-2).(y+3)=15
b,(3x+2).(1-y)=-7
c,xy-5x=14-(-1)
c',xy+x=5
d,5xy-5x+y=5
Tính giá trị của biểu thức :
a) \(\left(-125\right).\left(-13\right).\left(-a\right)\) với \(a=8\)
b) \(\left(-1\right).\left(-2\right).\left(-3\right).\left(-4\right).\left(-5\right).b\) với \(b=20\)
Bài 1:
a) -2.(x-5)-x+7=-7
b) 25-2.(x-5)2=7
c) (x2+5).(-9-3x)=0
d) (x2-1).(7-x2)>0
Tính :
a) \(\left(37-17\right).\left(-5\right)+23.\left(-13-17\right)\)
b) \(\left(-57\right)\left(67-34\right)\left(34-57\right)\)