tinh nhanh
a.1008-17119:(119-714:7)
b.2814:14-(23.52-156).2
c.412-[124-(42.23-268:4)]
3 tik
a) 3 . 52 - 16 : 22
b) 23 . 17 - 23 . 14
c) 20 - [ 30 - ( 5 - 1)2 ]
d) 1008 - 17119 : ( 119 - 714 : 7)
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=
a) 17119:(119-714:7)+3302:13-567
b)\(2^6:2^4+3^2-2^3\)
17119:(119-714:7)+3302:13-567
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+(17-3x4)]}:15
B=1800-{120-[36-(90:15x3)]}x15
C=2017-17119:(119-714:7)x2
D=128x430-6795+675+34125:375x15
E=5871:103+(247-82)-5-745
LUƯ Ý!! TÍNH NHANH GIÁ TRỊ BIỂU THỨC
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
tính nhanh mà bạn chứ tính thường mik xong lâu rồi
tính nhanh
a)1/4+1/5+3/4+2/5
b)2/7+5/14+1/7+3/14
\(a:=\left(\dfrac{1}{4}+\dfrac{3}{4}\right)+\left(\dfrac{1}{5}+\dfrac{2}{5}\right)\\ =1+\dfrac{3}{5}=1\dfrac{3}{5}\\ b:=\left(\dfrac{2}{7}+\dfrac{1}{7}\right)+\left(\dfrac{5}{14}+\dfrac{3}{14}\right)\\ =\dfrac{3}{7}+\dfrac{8}{14}\\ =\dfrac{3}{7}+\dfrac{4}{7}=1\)
Tính nhanh
a)5/9:4/7+13/9.7/4
b)14/13:1/2+3/13.2-2.7/13
a: \(=\dfrac{5}{9}\cdot\dfrac{7}{4}+\dfrac{13}{9}\cdot\dfrac{7}{4}=\dfrac{7}{4}\cdot2=\dfrac{7}{2}\)
b: \(=\dfrac{14}{13}\cdot2+\dfrac{3}{13}\cdot2-2\cdot\dfrac{7}{13}=\dfrac{28}{13}+\dfrac{6}{13}-\dfrac{14}{13}=\dfrac{20}{13}\)
Tìm số tự nhiên x biết :
a) 3(3x-9)=3^4
b) [( 6x-32) : 2 + 56] . 14 = 2814
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
tìm x
a,(x-35)-120=0
b,124+(118-x)=217
c,156-(x+61)=82
tik mk na xong mk tik lại
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
a.\(\left(x-35\right)-120=0\)
\(\Leftrightarrow x-35=120\)
\(\Leftrightarrow x=120+35\)
\(\Leftrightarrow x=155\)
b.\(124+\left(118-x\right)=217\)
\(118-x=217-124\)
\(\Leftrightarrow118-x=93\)
\(\Leftrightarrow x=118-93\)
\(\Leftrightarrow x=25\)
c.\(156-\left(x+61\right)=82\)
\(\Leftrightarrow x+61=156-82\)
\(\Leftrightarrow x+61=74\)
\(\Leftrightarrow x=74-61\)
\(\Leftrightarrow x=13\)
90872:296
tinh gia tri cua bieu thuc
6- 3\7*14\9=
tinh bang cach thuan tien
3\4*4\7= 3\7* 3\4+3\4=
ai tra loi nhanh thi minh tik cho
\(90872:296=307\)
\(6-\frac{3}{7}\)X \(\frac{14}{9}=\frac{124}{23}\)
\(\frac{3}{4}\)X \(\frac{4}{7}=\frac{3}{7}\)X \(\frac{3}{4}+\frac{3}{4}=\frac{9}{28}+\frac{3}{4}=\frac{15}{14}\)