-x-71+75=71+75-70
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RM
2
GN
GV Nguyễn Trần Thành Đạt
Giáo viên
8 tháng 2 2022
a) 35 x 2 x 9 x 5
= (35 x 9) x (2 x 5)
= (35 x 10 - 35) x 10
= (350 - 35) x 10
= 315 x 10 = 3150
b) 24 x 71 + 71 x 75 + 71
= 71 x (24+75+1)
=71 x 100
= 7100
TL
6 tháng 7 2021
=> 26 - 3x = 75 - 71
<=> 26 - 3x = 4
<=> 22 = 3x
<=> x = \(\dfrac{22}{3}\)
Vậy ...
4 tháng 10 2016
71 + ( 26 - 3 . x ) ; 5 = 75
( 26 - 3x ) : 5 = 75 - 71
( 26 - 3x ) : 5 = 4
26 - 3x = 4.5
26 - 3x = 20
3x = 26 - 20
3x = 6
x = 6 : 3
x = 2
4 tháng 10 2016
71+(26-3.x):5=75
71+(26-3x)=75.5=375
26-3x=375-71=304
3x=26-304=-278
x=\(\frac{-278}{3}\)
CM
26 tháng 4 2018
d) 71 + (26 – 3x) : 5 = 75
(26 – 3x) : 5 = 75 – 71
(26 – 3x) : 5 = 4
26 – 3x = 4 . 5
26 – 3x = 20
3x = 26 – 20
3x = 6
x = 6 : 3 = 2
Vậy x = 2
NT
7
22 tháng 8 2015
( 26 - 3x ) : 5 = 75 - 71
( 26 - 3x ) : 5 = 4
26 - 3x = 4 x 5
26 - 3x = 20
3x = 26 - 20
3x = 6
x = 6 : 3
x = 2
KY
14 tháng 7 2021
70. Everybody is here now, ___aren't they_______?
71. There is nothing wrong, _____isn't there_____?
72. Mike mustn’t come late, ____must he______?
73. She is collecting stamps, ____isn't she______?
74. They often watch TV in the afternoon, ______don't they____?
75. David has cleaned your bike, ____hasn't he______?
76. John and Max don't like Maths, ____do they______?
77. Peter played handball yesterday, ______didn't he____?
78. Mary didn't do her homework last Monday, ____did she______?
79. Lewis could have bought a new car, ______couldn't he____?
80. The train is arriving on time, ____isn't it______?
81. Kevin spent all his money yesterday, ____didn't he______?
82. He had hardly left the office when the telephone rang, _____hadn't he_____?
83. Max'd better stay here for a week, ____shouldn't he______?
84. Nothing was damaged during the storm, ______was it____?
85. Mrs. Black doesn't believe her son is able to draw such a picture, _____does she_____?
86. He comes late sometimes, ____doesn't he______?
87. He failed to do anything last weekend, ____didn't he______?
88. The Smiths hardly ever go on travel, __does they______?
89. Jack and Jill went up the hill, ____don't they______?
90. There are seven days in a week, ________aren't there__?
NQ
2
7 tháng 8 2021
\(\left(26-3x\right):5+71=75\)
\(\left(26-3x\right):5=4\)
\(26-3x=20\)
\(3x=6\)
\(x=2\)
\(-x-71+75=71+75-70\)
\(\Leftrightarrow-x=71+75-70-75+71\)
\(\Leftrightarrow-x=72\)
\(\Leftrightarrow x=-72\)
Vậy...........
Học hành chăm chỉ nha:0
- x - 71 + 75 = 71 + 75 - 70
=> -x = 71 + 71 + 75 - 75 - 70
=> -x = 72
=> x = -72
HOKK TỐTT