499 + (45 - x) = 58
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\(\left(100+58\right)\times58+\left(200-42\right)\times12\)
\(=158\times58+158\times12\)
\(=158\times\left(58+12\right)\)
\(=158\times70=11060\)
\(128\times72+14\times256\)
\(=128\times72+14\times2\times128\)
\(=128\times\left(72+28\right)\)
\(=128\times100=12800\)
![](https://rs.olm.vn/images/avt/0.png?1311)
x + x + x + x + 45 = 127 - 58
x . 4 + 45 = 69
x.4 = 69 - 45 = 24
x = 24 : 4
x = 6
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62 . 58 = (60 + 2)(60 - 2) = 60\(^2\) - 2\(^2\) = 3600 - 4 = 3596
199\(^2\) = (200 -1)\(^2\) = 200\(^2\) - 2.200.1 + 1\(^2\) = 40 000 - 400 + 1 = 39601
499\(^2\) = (500 - 1)\(^2\) = 500\(^2\) - 2.500.1 + 1\(^2\) = 250 000 - 1000 + 1 = 249 001
299 . 301 = (300 - 1)(300 + 1) = 300\(^2\) - 1\(^2\) = 90 000 - 1 = 89 999
Học tốt
Đúng thì k cho mk nhé
Trả lời:
+, \(62.58=\left(60+2\right)\left(60-2\right)=60^2-2^2=3600-4=3596\)
+, \(199^2=\left(200-1\right)^2=200^2-2.200.1+1^2=40000-400+1=39601\)
+, \(499^2=\left(500-1\right)^2=500^2-2.500.1+1^2=250000-1000+1=249001\)
+, \(299.301=\left(300-1\right)\left(300+1\right)=300^2-1=90000-1=89999\)
![](https://rs.olm.vn/images/avt/0.png?1311)
nhân hết ra là xong nha
a) 85x35-85x27-35x85+35x27=27x(35-85)=-1350
mấy cái kia cũng tương tự v
_Kudo_
![](https://rs.olm.vn/images/avt/0.png?1311)
a.35 x 34 + 35 x 38 + 65 x 75 + 45 x 65
= 35 x (34 + 38) + 65 x 75 + 65 x 45
= 35 x 72 + 65 x (75+45)
= 35 x 72 + 65 x 120
= 35 x 72 + 65 x (72 + 48)
= 35 x 72 + 65 x 72 + 65 x 48
= (35+65) x 72 + 65 x 48
= 100 x 72 + 65 x 48
= 7200 + 3120
= 10320
b.39 x 8 + 60 x 2 + 21 x 8
=39 x 8 + 15 x 4 x 2 +21 x 8
= 39 x 8 + 15 x 8 + 21 x 8
=(39 + 15 + 21) x 8
= 75 x 8
= 600
c.58 x 75 + 58 x 50 - 58 + 25
= 58 x 75 + 58 x 50 - 58 x 1 + 25
= 58 x(75+50-1)+25
= 58 x 124 + 25
= 7192 + 25
= 7217
d.125 x 98 - 125 x 46 - 52 x 25
= 25 x 5 x 98 - 25 x 5 x 46 - 25 x 52
= 25 x 490 - 25 x 230 - 25 x 52
= 25 x (490 - 230 - 52)
= 25 x 208
= 5200
![](https://rs.olm.vn/images/avt/0.png?1311)
45-58+(-45)-|-58|-3
=45-58-45-58-3
=(45-45)-(58+58)-3
=0-116-3
=-119
tk cho mk nha!
![](https://rs.olm.vn/images/avt/0.png?1311)
\(S=\left(1+4\right)+\left(4^2+4^3\right)+...+\left(4^{98}+4^{99}\right)\\ S=\left(1+4\right)+4^2\left(1+4\right)+...+4^{98}\left(1+4\right)\\ S=\left(1+4\right)\left(1+4^2+...+4^{98}\right)=5\left(1+4^2+...+4^{98}\right)⋮5\)
\(S=\left(1+4\right)+...+4^{98}\left(1+4\right)\)
\(=5\left(1+...+4^{98}\right)⋮5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
B)x+36=98
X=98-36
X=62
C)58-x+32=45
58-x=45-32
58-x=13
X=58-13
X=45
a) 36x - 54 = 18
36x = 18 + 54
36x = 72
x = 2
b) x + 36 = 98
x = 98 - 36
x = 62
c) 58 - x + 32 = 45
58 - x = 45 - 32
58 - x = 13
x = 58 - 13
x = 45
499+(45-x)=58
=> x =499+45
=> x=544
=> x = 544-58
=> x =486
hok tốt
499 + (45 - x) = 58
45 + x = 58 - 499
45 + x = -.441
x = -441 - 45
x= -486