Chương III : Phân số
Các câu hỏi tương tự
tính nhanh:
B = 7/18 .(-12/23 - 4/15) + 7/18 . (8/30 + 35/23)
2)B=13/15.0,25,3+{8/15-1 19/60}:1 23/24
bài 20 tính bằng phương pháp hợp lí nhất
a \(\frac{31}{23}-\left(\frac{7}{32}+\frac{8}{23}\right)\)
b \(\left(\frac{1}{3}+\frac{12}{67}+\frac{13}{41}\right)-\left(\frac{79}{67}-\frac{28}{41}\right)\)
c\(\frac{38}{45}-\left(\frac{8}{45}-\frac{17}{51}-\frac{3}{11}\right)\)
1.Tìm x, biết:
\(\left(x+\frac{1}{2}\right).\left(\frac{2}{3}-2x\right)=0\)
2.Tính hợp lí:
a.47.(23+50)-23.(47+50)
b.\(\frac{3}{6}+\frac{3}{30}+\frac{3}{70}+\frac{3}{126}+....+\frac{3}{286}\)
Tính hợp lí:
[(3+2/9).15/23.(1+7/29):5/23
(11/11×12+11/12×23+11/23×34+....+11/89×100)+x=2/3
Tính:
[(17+3535/88375)-(16+1001/1365)].(3+6/23)+(3+6/23).[5-(1+187/253)]
tìm x
a. 420+65:4 = (x+175):5+30
b. (32.15) :2 = (x+70) : 14 - 40
c. x - 4867 = (175.2050.70):25+23
j) dfrac{-3}{4} + dfrac{2}{7} + dfrac{-1}{4} +dfrac{3}{5} +dfrac{5}{7}k) dfrac{-2}{17}+ dfrac{15}{23} + dfrac{-15}{17} + dfrac{4}{19} +dfrac{8}{23}
Đọc tiếp
j) \(\dfrac{-3}{4}\) + \(\dfrac{2}{7}\) + \(\dfrac{-1}{4}\) +\(\dfrac{3}{5}\) +\(\dfrac{5}{7}\)
k) \(\dfrac{-2}{17}\)+ \(\dfrac{15}{23}\) + \(\dfrac{-15}{17}\) + \(\dfrac{4}{19}\) +\(\dfrac{8}{23}\)