Toán Lớp 7: a, 3/4-1/4:x=1/5
b,-3/5+1/4″x=-2/5
c,-11/12x+0,25=5/6
d,x/3,15=0,15/7,2
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Toán Lớp 7: a, 3/4-1/4:x=1/5
b,-3/5+1/4″x=-2/5
c,-11/12x+0,25=5/6
d,x/3,15=0,15/7,2
Comments ( 2 )
a)
3/4-1/4:x=1/5
1/4:x=3/4-1/5
1/4:x=11/20
x=1/4:11/20
x=5/11
b)
-3/5+1/4:x=-2/5
1/4:x=-2/5-(-3/5)
1/4:x=-2/5+3/5
1/4:x=1/5
x=1/4:1/5
x=5/4
c)
-11/12x+0,25=5/6
-11/12x=5/6-0,25
-11/12x=7/12
x=7/12:(-11/12)
x=-7/11
d)
x/(3,15)=(0,15)/(7,2)
x=(0,15. 0,35)/(7,2)
x=7/960
a) $\frac{3}{4}$ – $\frac{1}{4}$ : x= $\frac{1}{5}$
$\frac{1}{4}$ : x= $\frac{3}{4}$ – $\frac{1}{5}$
$\frac{3}{4}$ : x= $\frac{11}{20}$
x= $\frac{3}{4}$ : $\frac{11}{20}$
x= $\frac{15}{11}$
b)$\frac{-3}{5}$ + $\frac{1}{4}$”x ko hiểu câu hỏi
c) $\frac{-11}{12}$x + 0,25 = $\frac{5}{6}$
$\frac{-11}{12}$x = $\frac{5}{6}$ – 0,25
$\frac{-11}{12}$x = $\frac{7}{12}$
x = $\frac{7}{12}$ : $\frac{-11}{12}$
x = $\frac{-7}{11}$
d) $\frac{x}{3,15}$ = $\frac{0,15}{7,2}$
0,15.3,15 = x. 7,2
0,4725 = 7,2x
x = 0,4725 : 7,2
x = 0,065625