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13/15-(y.4/15-2/9).3/5=1/5
(y.4/15-2/9).3/5=13/15-1/5
(y.4/15-2/9).3/5=2/3
y.4/15-2/9=2/3:3/5
y.4/15-2/9=10/9
y.4/15=10/9+2/9
y.4/15=4/3
y=4/3:4/15
y=5
Những chỗ có dấu "." thì thay bằng dấu nhân
1.
7/15:(1/2-9/10xX)-1/6=13/6
=>7/15:(1/2-9/10xX)=13/6+1/6
=>7/16:(1/2-9/10xX)=7/3
=>1/2-9/10xX=7/16:7/3
=>1/2-9/10xX=3/16
=>9/10xX=1/2-3/16
=>9/10xX=5/16
=>X=5/16:9/10
=>X=25/72
245 -5 . (16 + x ) = 140
5 . ( 16 + x ) = 245 - 140
5 . ( 16 + x ) = 105
16 + x = 105 : 5
16 + x = 21
x = 21 - 16
x = 5
\(\frac{3}{4}:x=\frac{1}{2}-\frac{4}{5}\)
ĐẾN ĐÂY LÀ SAI ĐỀ RÔI
\(\frac{4}{5}+\frac{3}{4}:x=\frac{1}{2}\)
\(\frac{3}{4}:x=\frac{1}{2}-\frac{4}{5}=-\frac{3}{10}\)
\(x=\frac{3}{4}:\frac{-3}{10}=-\frac{5}{2}\)
12 x 194+6x+3x369x4=
12x194+6x2x437+3x4x369=
12x194+12x437+12x369=
12x{194+437+369}=
12x1000=
12000
1+5+9+13+.....+57+61+65x2-6
={65+1}x4:2x2-6
=66x2x2-6
=132x2-6
=264-6
=258
a/7/9(1/4+3/4)=7/9.1=7/9
b/13/9(16/5-14/5+3/5)=13/9.1=13/9
34cm=34/100m
524mm=524/1000m
70mm=70/1000=7/100m
a/7/9(1/4+3/4)=7/9.1=7/9
b/13/9(16/5-14/5+3/5)=13/9.1=13/9
34cm=34/100m
524mm=524/1000m
70mm=70/1000=7/100m
a) X+ \(\frac{4}{5}\)x \(\frac{15}{16}\)= \(\frac{5}{2}\).
X+ \(\frac{3}{4}\)= \(\frac{5}{2}\).
X= \(\frac{5}{2}\)- \(\frac{3}{4}\).
X= \(\frac{7}{4}\).
b) X: \(\frac{5}{9}\)+ \(\frac{1}{5}\)= 2.
X: \(\frac{5}{9}\)= 2- \(\frac{1}{5}\).
X: \(\frac{5}{9}\)= \(\frac{9}{5}\).
X= \(\frac{9}{5}\)x \(\frac{5}{9}\).
X= 1.
a, x+4/5x15/16=5/2
x+3/4=5/2
x=5/2-3/4
x=7/4
b, x:5/9+1/5=2
x:5/9=2-1/5
x:5/9=9/5
x=9/5x5/9
x=1