2 Tìm số nguyên x biết
a\(\frac{x}{6}+\frac{x}{10}+\frac{x}{15}+\frac{x}{21}+\frac{x}{28}+\frac{x}{36}+\frac{x}{45}+\frac{x}{55}+\frac{x}{66}+\frac{x}{78}=\frac{220}{39}\)\(\frac{220}{39}\)
b 52x-3 - 3. 52= 52
3.Cho A= 3+ 32+ 34+ 390
Chứng tỏ A chia hết cho 11 và 13
1. Tìm x thuộc Z biết:
a,\(\frac{-5}{6}.\frac{120}{25}< x< \frac{-7}{15}.\frac{9}{14}\)
b,\(\left(\frac{-5}{3}\right)^3< x< \frac{-24}{35}.\frac{-5}{6}\)
2. Thực hiện phép tính:
a,\(\left(\frac{9}{10}-\frac{15}{16}\right).\left(\frac{5}{12}-\frac{11}{15}-\frac{7}{20}\right)\)
b,\(\frac{-3}{5}+\frac{28}{5}.\left(\frac{43}{56}+\frac{5}{24}-\frac{21}{63}\right)\)
AI GIÚP MIK VỚI,MIK DÂNG CẦN GẤP,SÁNG MAI MIK PHẢI NỘP CHO CÔ RỒI,GIÚP MIK NHA
Câu 1 tính hợp lí
a,A=\(\frac{-9}{11}.\frac{3}{8}-\frac{9}{11}.\frac{5}{8}+\frac{17}{11}\)
b,B=\(\frac{2}{1.3}+\frac{2}{3.5}+\frac{2}{5.7}+...+\frac{2}{53.55}\)
Câu2 tìm x
a,\(x+5-\frac{1}{2}=3\frac{1}{2}\)
b,\(3^{x+1}=27\)
c,\(2016.\left[25-\left(3x+2\right)\right]=3^2.7\)
d,\(\frac{x}{6}+\frac{x}{10}+\frac{x}{15}+\frac{x}{21}+\frac{x}{28}+\frac{x}{36}+\frac{x}{45}+\frac{x}{60}+\frac{x}{78}=\frac{220}{39}\)
Ai giải nhanh tớ tick cho
Thank you
tìm x :
a)\(x:4\frac{1}{3}=2.5\)
b)\(x:\frac{-3}{5}=\frac{-10}{21}\)
c)\(\frac{2}{3}.x-\frac{1}{2}=\frac{1}{10}\)
d)\(\frac{1}{3}.x+\frac{2}{5}\left(x-1\right)=0\)
e)\(\frac{1}{2}.x+\frac{1}{2}=\frac{5}{2}\)
f)\(\frac{-2}{3}-\frac{1}{3}\left(2x-5\right)=\frac{3}{2}\)
g)\(\left(3x-1\right)\left(-\frac{1}{2}.x+5\right)=0\)
h)\(3\frac{1}{3}+\frac{5}{6}.x=3\frac{1}{2}\)
Tìm x
a, \(\frac{x}{2}+\frac{x}{3}+\frac{x}{5}-\frac{1}{3}=\frac{2}{15}\)
b, x + 2 + x +3 + x +5 = 28
c, { x + 1 } + { x + 2 } + .........+ { x + 9 } = 45
\(x+\frac{-1}{5}=\frac{-2}{15}\)
1 THỰC HIỆN PHÉP TÍNH
A = \(2\frac{1}{2}:0,8-2\frac{1}{2}.\left(\frac{2}{3}+\frac{1}{5}\right)\)
2 TÌM X ,Y \(\in z\), BIẾT
A )\(\frac{6}{x}=\frac{Y}{28}=\frac{-9}{21}\)
B ) \(\frac{x}{30}=\frac{5}{6}+\frac{-2}{3}.\frac{1}{5}\)
3 CHO CÁC BIỂU THỨC
A =\(\frac{4}{3}.\frac{5}{19}-\frac{7}{10}.\frac{5}{19}\)
B = \(\frac{2}{3}:5+\frac{3}{5}-\frac{8}{15}\)
a ) TÍNH A VÀ B
b) SO SÁNH A VÀ B
Tìm x:\(\left(\frac{x}{-5}+\frac{2}{3}\right):\frac{11}{5}-1,4.\frac{15}{49}=\frac{5}{21}\)
bài 1 : tìm x biết
a, \(\frac{2}{3}\times\left(x-\frac{5}{6}\right)+\frac{1}{4}=\frac{22}{9}\)
b, \(\frac{2}{3}:\frac{x}{5}=\frac{10}{21}\)
c, \(\frac{7}{3}:\frac{x}{5}=\frac{14}{15}\)
d, \(1-\left(5\frac{4}{9}\times x-7\frac{7}{18}\right):15\frac{3}{4}=0\)
bài 2 : tính gtri bt
a,\(\frac{8}{7}+\frac{1}{5}\times\frac{10}{9}\)
b, \(\frac{3}{2}+\left(\frac{9}{2}+\frac{2}{9}\right)\times\left(\frac{4}{3}-\frac{5}{4}\right)\)
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