x+x+x+x+x -1345+134=1657
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a) 1345 x 37 + 43 x 1345 + 1345 x 18 + 2690
= 1345 x 37 + 43 x 1345 + 1345 x 18 + 1345 x 2
=1345 x (37 + 43 + 18 + 2)
=1345 x 100
=134500
b) (237 x 478 + 45678 : 345) x (23 x 25 - 575)
=(237 x 478 + 45678 : 345) x (575 - 575)
=(237 x 478 + 45678 : 345) x 0
=0
học tốt em nhé
a) \(x+657=1657\)
\(\Rightarrow x=1657-657\)
\(\Rightarrow x=1000\)
b) \(4059+x=7876\)
\(\Rightarrow x=7876-4059\)
\(\Rightarrow x=3817\)
c) \(x-1245=6478\)
\(\Rightarrow x=6478+1245\)
\(\Rightarrow x=7723\)
d) \(6535-x=4725\)
\(\Rightarrow x=6535-4725\)
\(\Rightarrow x=1810\)
a) \(x+657=1657\)
\(x=1657-657\)
\(x=1000\)
b) \(4059+x=7876\)
\(x=7876-4059\)
\(x=3781\)
c) \(x-1245=6478\)
\(x=6478+1245\)
\(x=7723\)
d) \(6535-x=4725\)
\(x=6535-4725\)
\(x=1810\)
x: 2 + x : 5 = 1345
x : (2+ 5 ) = 1345
x: 7 = 1345
x = 1345 x7
x = 9415
-----------------------------------
x + X x 2 + X x 3 + X x 4 = 530
X x 1+ X x 2 + X x 3 + X x 4 = 530
X x (1 + 2 + 3 + 4 ) = 530
X x 10 = 530
X = 530 : 10
X = 53
1) Ta có: \(\left(-86-x\right)-\left(3+2x\right)=-4-15\)
\(\Leftrightarrow-86-x-3-2x+4+15=0\)
\(\Leftrightarrow-3x-70=0\)
\(\Leftrightarrow-3x=70\)
hay \(x=-\dfrac{70}{3}\)
Vậy: \(x=-\dfrac{70}{3}\)
2) Ta có: \(18+\left(-x\right)-\left(40-28\right)=-32-\left(-18\right)\)
\(\Leftrightarrow18-x-40+28+32-18=0\)
\(\Leftrightarrow-x+20=0\)
\(\Leftrightarrow-x=-20\)
hay x=20
Vậy: x=20
3) Ta có: \(-27-\left(-31+x\right)-25=-5-17\)
\(\Leftrightarrow-27+31-x-25+5+17=0\)
\(\Leftrightarrow-x+1=0\)
\(\Leftrightarrow-x=-1\)
hay x=1
Vậy: x=1
4) Ta có: \(-9-14-x+42-38=-5+13\)
\(\Leftrightarrow-x-19=8\)
\(\Leftrightarrow-x=27\)
hay x=-27
Vậy: x=-27
=28,8x(71,2+28,2)x134x(1,1-0,1-1)
= ...........................x134x0
=..............x0
=0
134 x 27 + 636 x 134 + 134 x 324 + 134
= 134 x ( 27 + 636 + 324 + 1)
= 134 x 988
=132392
(1345-13x):7+145=248
(1345-13x):7=248-145
(1345-13x):7=103
1345-13x=103*7
1345-13x=721
13x=1345-721
13x=624
x=624:13
x=48
Ta có :
( 1345 - 13x ) : 7 + 145 = 284
( 1345 - 13x ) : 7 = 284 - 145
(1345 - 13x ) : 7 = 139
1345 - 13x = 139 . 7
1345 - 13x = 973
13x = 1345 - 973
13x = 372
x = 372 : 13
x = 372/13
Vậy x = 372/13
[ 71,2 x 28,8 + 28,8 x 28,2] x [ 134 x 1,1 - 134 x 0,1 - 134 ]
= [ 71,2 x 28,8 + 28,8 x 28,2] x 134x ( 1,1 - 0,1 - 1 )
= [ 71,2 x 28,8 + 28,8 x 28,2] x 134 x 0
= 0
= [ 28,8 x ( 71,2 + 28,2 ) ] x [ 134 x ( 1,1 - 0,1 -1 )
= [ 28,8 x 99,4 ] x [ 134 x 0 ]
= 2862,72 x 0
= 0
Tiện thể kb vs mình luôn nhé!
x + x + x + x + x - 1345 + 134 = 1657
=> 5x - 1211 = 1657
=> 5x = 1657 + 1211
=> 5x = 2865
=> x = 2865 : 5
=> x = 573, 6
HT