3,67 . 58,35 + 58,35 . 6,33
= ( 3,67 + 6,33 ) . 58,35
= 10 . 58,35
= 583,5
~ Chúc bạn học giỏi ! ~
3,67 . 58,35 + 58,35 . 6,33
= ( 3,67 + 6,33 ) . 58,35
= 10 . 58,35
= 583,5
~ Chúc bạn học giỏi ! ~
BT3: Tính nhanh:
4) \(\dfrac{4678.4679+4680.31+4648}{4680.4679-4678.4679}\)
BT3: Tính nhanh:
1) \(\dfrac{5}{18}+\dfrac{4}{7}+\dfrac{13}{18}+\dfrac{3}{7}\)
2) \(\dfrac{4}{9}.\dfrac{5}{19}.\dfrac{9}{4}\)
BT3 :Chứng Minh
3) \(\overline{aaabbb}\) \(⋮\) 37
BT3: Tìm x, biết
21) \(\dfrac{1}{5.8}+\dfrac{1}{8.11}+\dfrac{1}{11.14}+...+\dfrac{1}{x.\left(x+3\right)}=\dfrac{101}{1540}\)
BT3: Tìm x, biết
20) \(\dfrac{1}{3}+\dfrac{1}{6}+\dfrac{1}{10}+...+\dfrac{1}{x.\left(x+1\right):2}=\dfrac{1998}{2000}\)
BT3 :Chứng Minh
6) S = 2 + 2\(^2\) + 2\(^3\) + .... + 2\(^{12}\) chia hết cho 3 , chia hết cho 7 ; 5 ; 6
BT3: Tìm x, biết
10) \(\left(\dfrac{2x}{5}-1\right):\left(-5\right)=\dfrac{1}{4}\)
12) \(\left(3\dfrac{1}{4}:x\right).\left(-1\dfrac{1}{4}\right)=-\dfrac{5}{3}-\dfrac{5}{6}\)
BT3 :Chứng Minh
4) \(\overline{abba}\) \(⋮\) 11
BT3: Tìm x, biết
13) \(\left(-1\dfrac{1}{5}+x\right):\left(-3\dfrac{3}{5}\right)=\dfrac{-7}{4}+\dfrac{1}{4}:\dfrac{1}{8}\)
14) \(\dfrac{11}{13}-\left(\dfrac{5}{42}-x\right)=-\left(\dfrac{15}{28}-\dfrac{11}{13}\right)\)