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1) \(\left|4-2x\right|.\dfrac{1}{3}=\dfrac{1}{3}\)
\(\left|4-2x\right|=\dfrac{1}{3}:\dfrac{1}{3}\)
\(\left|4-2x\right|=\dfrac{1}{3}.3\)
\(\left|4-2x\right|=1\)
=>\(4-2x=\pm1\)
+)\(TH1:4-2x=1\) +)\(TH2:4-2x=-1\)
\(2x=4-1\) \(2x=4-\left(-1\right)\)
\(2x=3\) \(2x=4+1\)
\(x=3:2\) \(2x=5\)
\(x=1,5\) \(x=5:2\)
Vậy x=1,5 \(x=2,5\)
Vậy x=2,5
2) \(\left(-3\right)^2:\left|x+\left(-1\right)\right|=-3\)
\(9:\left|x+\left(-1\right)\right|=-3\)
\(\left|x+\left(-1\right)\right|=9:\left(-3\right)\)
\(\left|x+\left(-1\right)\right|=-3\)
=> \(x+\left(-1\right)\) sẽ không có giá trị nào ( Vì giá trị tuyệt đối luôn luôn lớn hơn hoặc bằng 0 )
Vậy x = \(\varnothing\)
a, (10/3:x).(-5/4)=-10/3
10/3:x=-10/3:(-5/4)
10/3:x=8/3
x=10/3:8/3
x=5/4
b,(-6/5+x):(-18/5)=-1/4
-6/5+x=-1/4.(-18/5)
-6/5+x=9/10
x=9/10-(-6/5)=9/10+6/5
x=21/10
c,-22/15.x+1/3=-2/5
-22/15.x=-2/5-1/3=-11/15
x=-11/15:(-22/15)
x=11/21
d,(0,25-30%x).1/3=-31/6+1/4=-59/12
1/4-3/10x=-59/12:1/3=-59/4
3/10x=1/4-(-59/4)=1/4+59/4=15
x=15:3/10
x=50
e,(0,5x-3/7):1/2=8/7
1/2x=8/7.1/2=4/7
x=4/7:1/2
x=8/7
bn ơi ko thì bn làm từng phép một cũng đc nhé các bn giải hộ mình mai mình phải nộp rồi
1) (-6-2)*(-6+2)=-8*(-4)=32
2) (7*3-3):(-6)=18:(-6)=-3
3) (-5+9)*(-4)=4*(-4)=-16
4) 72:(-6*2+4)=72:(-8)=-9
5) -3*7-4*(-5)+1=-21-(-20)+1=-21+20+1=0
6) 18-10:(+2)-7=18-5-7=6
7) 15:(-5)*(-3)-8=9-8=1
8) (6*8-10:5)+3*(-7)=48-2-21=25
Tính:
\(\frac{2}{3}+\frac{3}{4}=\frac{8}{12}+\frac{9}{12}=\frac{17}{12}\)
\(\frac{1}{5}+\frac{3}{2}=\frac{2}{10}+\frac{15}{10}=\frac{17}{10}\)
\(\frac{6}{5}-\frac{2}{3}=\frac{18}{15}-\frac{10}{15}=\frac{8}{15}\)
\(\frac{7}{2}-\frac{3}{4}=\frac{14}{4}-\frac{3}{4}=\frac{11}{4}\)
\(1\frac{2}{5}+\frac{7}{2}=\frac{7}{5}+\frac{7}{2}=\frac{14}{10}+\frac{35}{10}=\frac{49}{10}\)
\(2\frac{1}{8}-\frac{5}{6}=\frac{17}{8}-\frac{5}{6}=\frac{51}{24}-\frac{20}{24}=\frac{31}{24}\)
\(0,75+2\frac{1}{3}=\frac{3}{4}+\frac{7}{3}=\frac{9}{12}+\frac{28}{12}=\frac{37}{12}\)
\(1-\frac{1}{4}-0,25=1-\frac{1}{4}-\frac{1}{4}=\frac{4}{4}-\frac{1}{4}-\frac{1}{4}=\frac{2}{4}=\frac{1}{2}\)
\(\frac{11}{2}-\frac{5}{3}+\frac{7}{4}=\frac{66}{12}-\frac{20}{12}+\frac{21}{12}=\frac{67}{12}\)
\(\frac{5}{6}+1\frac{2}{3}-\frac{1}{4}=\frac{5}{6}+\frac{5}{3}-\frac{1}{4}=\frac{10}{12}+\frac{20}{12}-\frac{3}{12}=\frac{27}{12}=\frac{9}{4}\)
\(0,5+2\frac{3}{5}-\frac{5}{4}=\frac{1}{2}+\frac{13}{5}-\frac{5}{4}=\frac{10}{20}+\frac{52}{20}-\frac{25}{20}=\frac{37}{20}\)
\(3\frac{1}{2}-\frac{5}{6}+1,2=\frac{7}{2}-\frac{5}{6}+\frac{6}{5}=\frac{105}{30}-\frac{25}{30}+\frac{36}{30}=\frac{116}{30}=\frac{58}{15}\)
\(\frac{1}{3}+2\frac{1}{4}=\frac{1}{3}+\frac{9}{4}=\frac{4}{12}+\frac{27}{12}=\frac{31}{12}\)
\(\frac{7}{2}+\frac{3}{4}+\frac{7}{12}=\frac{42}{12}+\frac{9}{12}+\frac{7}{12}=\frac{58}{12}=\frac{29}{6}\)
\(2-\frac{4}{9}-\frac{1}{6}=\frac{36}{18}-\frac{8}{18}-\frac{3}{18}=\frac{25}{18}\)
Chúc bạn hok tốt !!! ღℓїŋɦ✿şʉŋღ
`5/6+6/7-1/6+7/3`
`=(5/6-1/6+7/3)+6/7`
`=(4/6+7/3)+6/7`
`=(2/3+7/3)+6/7`
`=9/3+6/7`
`=3+6/7`
`=21/7+6/7`
`=27/7`