a,15+x+27+53=100 b, 207<x+17<210
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a) 207-10x+7=84
10x=130
x=13
b)=> 3x-15=0
3x=15
x=5
c) 53+132-x=184
132-x=131
x=1
d) 85-5x=25
5x=60
x=12
e) x-4=12
x=16
a/ 1260: [207-(10x-7)]=15
207-(10x-7) =1260:15= 84
10x-7= 207-84=123
10x=123+7=130
x= 130:10=13
b/1236.(3x-15)=0
3x-15= 0:1236=0
3x =0+15=15
x =15:3=5
Ko chắc nhé !!! ^_^
15+x+27+53=100. x-36-38=239
x + ( 15 + 27 + 53 ) = 100 x - 36 = 239 + 38
x + 95 = 100 x - 36 = 277
x = 100 - 95 x = 277 + 36
x = 5 x = 313
a) `123 - 27 + 27 + 13 - 123`
`= (123 - 123) + (27 - 27) + 13`
`= 0 + 0 + 13`
`= 13`
`---`
b) `175 + 25 + 13 + 15 - 175 - 25`
`= (175-175)+(25-25)+25+13`
`=0+0+25+13`
`=28`
`---`
c) \(53\times39+47\times39+53\times21+47\times21\)
\(=\text{[}\left(53+47\right)\times39]+\left[\left(53+47\right)\times21\right]\)
\(=\left(100\times39\right)+\left(100\times21\right)\)
\(=3900+2100\)
`=6000`
`---`
d) \(49\times35+49\times16-49\times61\)
`=` \(49\times\left(35+16-61\right)\)
`=` \(49\times\left(-10\right)\)
`=-490`
5) 24*(15+49)+12*(50+42)
=24*64+12*92
=24*64+12*2*46
=24*64+24*46
=24*(64+46)
=24*110
=2640
a) \(\text{13 x 58 x 4 + 32 x 26 x 2 + 52 x 10 }\)
\(\text{=(13 x 4 ) x 58 + 32 x 13 x 2 x 2 + 13 x 4 x 10}\)
\(\text{= ( 13 x 4 ) x 58 + 32 x ( 13 x 2 x 2 ) + ( 13 x 4 ) x 10 }\)
\(\text{= 52 x 58 + 32 x 52 + 52 x 10}\)
\(\text{=52 x ( 58 + 32 + 10 )}\)
\(\text{=52 x 100 = 5200}\)
b) \(\text{14 x 35 x 5 + 10 x 25 x 7 + 20 x 70 x 2}\)
\(\text{= ( 14 x 5 ) x 35 + (10 x 7 ) x 25 + 20 x 70 x 2 }\)
\(\text{= 70 x 35 + 70 x 25 + 20 x 2 x 70 }\)
\(\text{= 70 x ( 35 + 25 + 40 )}\)
\(\text{= 70 x 100 = 7000 }\)
e) \(\text{5.3.37.4+5.24.21+21.5.12}\)
\(\text{= 5.(3.37.4+24.21+21.12)}\)
\(\text{= 5.1200}\)
\(=6000\)
a , 5
b , 191 hoặc 192
a, 5
b, 191 hoặc 192
Đổi k nhé
#LYB#