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A=17x32+64x83+36x83+68x17
A=17x32+17x68+64x83+36x83
A=17x(32+68)+83x(64+36)
A=17x100+83x100
A=100x(83+17)
A=100x100
A=10000
a,,83+17x=100
\(\Rightarrow\)17x=100-83
\(\Rightarrow17x=17\)
\(\Rightarrow\)x=1
Vậy x=1
b,100-64:(x-1)=36
\(\Rightarrow\)64:(x-1)=100-36
\(\Rightarrow\)64:(x-1)=64
\(\Rightarrow\)x-1=1
\(\Rightarrow\)x=2
Vậy x=2
13 + 21.5 - (198 : 11 - 8)
= 13 + 105 - 10
= 108
272 : 16 - 5 +4 (30 - 5 - 255 : 17)
= 17 - 5 + 4. ( 30 - 5 - 15 )
= 16 . 10
= 160
15.24 - 14.5 (145 : 5 - 27)
= 360 - 70 ( 29 - 27 )
= 290 . 2
= 580
18.3 - 18.2 + 3 (51 : 17)
= 54 - 36 + 3 . 3
= 54 - 36 + 9
= 27
(64 + 115 + 36) - 25.8
= 215 - 200
= 15
15.8 - (17 - 30 + 83) - 144 : 6
= 120 - 70 - 24
= 26
250 : 50 - (46 - 75 + 54) : 5
= 5 - 25 : 5
= 5 - 5
= 0
13 (17 - 95 + 83) : 5 - 18 : 9
= 13. 5 : 5 - 2
= 65 : 5 - 2
= 13 - 2
= 11
140 - 180(47 - 90 + 43) + 7
= 140 - 180 . 0 + 7
= 140 + 7
= 147
24 (15 + 30 + 85 - 120):10
= 24. 10 : 10
= 240 : 10
= 24
27 + 73 - 30 : (25 -10)
= 27 + 73 - 30 : 15
= 27 + 73 - 2
= 98
18 - 4 (27 - 90 + 73) : 10
= 18 - 4. 10 : 10
= 18 - 40 : 10
= 18 - 4
= 14
Bài 2: Tính
140 - [ 25 : (4 mũ 2 - 11) + 4 ]
= 140 - [25 : (16 - 11) + 4 ]
= 140 - [ 25 : 5 + 4 ]
= 140 - [ 5 + 4]
= 140 - 9
= 131
17*25 + 17*32 + 83*25 + 83*32
= 17*(25 + 32) + 83*(25 + 32)
= (25 + 32)(17 + 83)
= 57*100
= 5700
\(17.25+17.32+83.25+83.32\)
\(=17.\left(25+32\right)+83.\left(25+32\right)\)
\(=\left(25+32\right)\left(17+83\right)\)
\(=57.100\)
\(=5700\)
a,(-17)+(-83)+2017+53
= -100+2017+53
=1917+53
=1970
b,(-64)+(-12)+(-36)
= -76+(-36)
=-112
c,27.152-22.27+73.130
= 27.(152-22)+73.130
=27.130+73.130
=130.(27+73)
=130.100
=13000
A) (-17)+ (-83)+ 2017+53
=(-17)+ 2017+(-83)+53
=2000+ 30
=2030
B) (-64)+(-12)+(-36)
= -76+(-36)
=-103
C) 27. 152- 22. 27+ 73. 130
=27.(152-22+73). 130
=27. 203. 130
= 5481. 130
= 712530
2:
a: \(2^2\cdot3-4=4\cdot3-4=12-4=8\)
b: \(16-2^3\cdot2=16-2^4=16-16=0\)
c: \(4^2-4\cdot2=16-8=8\)
d: \(3^3-2\cdot3^2=27-2\cdot9=27-18=9\)
e: \(7^2-9\cdot2^2=49-9\cdot4=49-36=13\)
f: \(2^2\cdot3+4^2=4\cdot3+16=12+16=28\)
Bài 1:
a: \(13+21\cdot5-\left(198:11-8\right)\)
\(=13+105-18+8\)
=21+87
=108
b: \(272:16-5+4\cdot\left(30-5-255:17\right)\)
\(=17-5+4\cdot\left(30-5-15\right)\)
\(=12+4\cdot10=12+40=52\)
c: \(15\cdot24-14\cdot5\cdot\left(145:5-27\right)\)
\(=360-70\left(29-27\right)\)
=360-140
=220
d: \(18\cdot3-18\cdot2+3\cdot\left(\dfrac{51}{17}\right)\)
\(=18\left(3-2\right)+3\cdot3\)
=18+9
=27
e: \(64+115+36-25\cdot8\cdot6\cdot2^2\cdot3+4^2\)
\(=100+115-200\cdot6\cdot4\cdot3+16\)
\(=231-14400=-14169\)
f: \(15\cdot8-\left(17-30+83\right)-144:6\)
\(=120-24-\left(100-30\right)\)
=96-70
=26
a) 135 - ( x + 32 ) = 80
x + 32 = 135 - 80
x + 32 = 55
x = 55 - 32
x = 23
b)( x - 17 ) + 52 = 158
x - 17 = 158 - 52
x - 17 = 106
x = 106 + 17
x = 123
c x : 17 + 83 = 297
x : 17 = 297 - 83
x : 17 = 214
x = 214 x 17
x = 3638
d) 9052: x - 56 = 17
9052 : x = 17 + 56
9052 : x = 73
x = 9052 : 73
x = \(\frac{1004}{17}\)
A=17.32+64.83+36.83+68.17
=>17.(32+68)+83.(64+36)
=>17.100+83.100
=>100.(17+83)
=>100.100
=>10000
Học tốt~