tinh nhanh
a.1008-17119:(119-714:7)
b.2814:14-(23.52-156).2
c.412-[124-(42.23-268:4)]
3 tik
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a)=3.10-16:4
=30-4=26
b)=8.17-8.14
=8.(17-14)=8.3=24
c)=20-(30-16)
=20-14=6
d)=1008-17119:(119-102)
=1008-17119:17
=1008-1007=1
tính phếp toán sau
a,1008-17119 : [119-714:7] =
b 128. 430 - 6795 + 675 - 34125 : 375 =
c 5871:103+[247-82] . 5-1=
17119 : ( 119 - 714 : 7 ) + 3302 : 13 - 567
=17119 : ( 119 - 102 ) + 254 - 567
= 17119 : 17 + 254 - 567
= 1007 + 254- 567
= 1261 - 567
= 694
hok tốt
A= 30-(60-(2+(17-12))):15
A=(60-(2+5)):15
A=30-(60-7):15
A=30-53:15
A=30-53/15=397/15
\(a:=\left(\dfrac{1}{4}+\dfrac{3}{4}\right)+\left(\dfrac{1}{5}+\dfrac{2}{5}\right)\\ =1+\dfrac{3}{5}=1\dfrac{3}{5}\\ b:=\left(\dfrac{2}{7}+\dfrac{1}{7}\right)+\left(\dfrac{5}{14}+\dfrac{3}{14}\right)\\ =\dfrac{3}{7}+\dfrac{8}{14}\\ =\dfrac{3}{7}+\dfrac{4}{7}=1\)
a: \(=\dfrac{5}{9}\cdot\dfrac{7}{4}+\dfrac{13}{9}\cdot\dfrac{7}{4}=\dfrac{7}{4}\cdot2=\dfrac{7}{2}\)
b: \(=\dfrac{14}{13}\cdot2+\dfrac{3}{13}\cdot2-2\cdot\dfrac{7}{13}=\dfrac{28}{13}+\dfrac{6}{13}-\dfrac{14}{13}=\dfrac{20}{13}\)
3. ( 3 x - 9 ) = 81
3 x - 9 = 81 : 3
3 x - 9 = 27
3 x = 27 + 9
3 x = 36
x = 36 : 3
x = 12
[( 6 x - 32 ) : 2 + 56 ] . 14 = 2814
( 6 x - 32 ) : 2 + 56 = 2814 : 14
( 6 x - 32 ) : 2 = 201 - 56
6 x - 32 = 145. 2
6 x = 290 + 32
x = 322 : 6
dư nha bạn
a, (X-35)-120=0
X-35 =120+0
X-35 =120
X =120+35
X =155
b,124+(118-X)=217
118-X =217-124
118-X=93
X=118-93
X=25
c,156-(X+61)=82
X+61=156-82
X+61=74
X =74-61
X =13
k cho mình đi rồi mình k lại cho
a,(x-35)-120=0
x-35=120
x=120+35
x=155
b,124+(118-x)
118-x=217-124
118-x=93
x=118-93
x=25
c,156-(x+61)=82
x+61=156-82
x+61=74
x=74-61
x=13
\(90872:296=307\)
\(6-\frac{3}{7}\)X \(\frac{14}{9}=\frac{124}{23}\)
\(\frac{3}{4}\)X \(\frac{4}{7}=\frac{3}{7}\)X \(\frac{3}{4}+\frac{3}{4}=\frac{9}{28}+\frac{3}{4}=\frac{15}{14}\)
1008 - 17119 : ( 119 - 714 : 7 )
= 1008 - 17119 : ( 119 - 17 . 42 : 7 )
= 1008 - 17119 : ( 119 - 17 . 6 )
= 1008 - 17119 : ( 119 - 102 )
= 1008 - 17119 : 17
= 1008 - 1007
= 1