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a 86+14+357=100+357=457
b 72+128+69=200+69=269
c (25.4).(5.2).4.27
=100.10.4.27
=1000.4.27
=4000.27=64000
d 28. (64+36)=28.100=2800
nha
a) 86 + 357 + 14 b ) 72 + 69 +128
= ( 86 + 14 ) + 357 = ( 72 + 128 ) + 69
= 100 + 357 = 200 + 69 = 269
= 457
c) 25 . 5 . 4 . 27 .2
= ( 25.4).(5.2).27
= 100 x 10 x 27
= 1000 x 27
= 27 000
d) 28.64+28.36
= 28 . ( 64 + 36 )
= 28.100
= 2800
a) 86 + 357 + 14
= ( 86 + 14 ) + 357
= 100 + 357
= 457
b) 72 + 69 + 128
= ( 72 + 128 ) + 69
= 200 + 69
= 269
c) 25 . 5 . 4 . 27
= ( 25 . 4 ) . 5 . 27
= 100 . 5 . 27
= 500 . 27
= 13500
d) 28 . 64 + 28 . 36
= 28 . ( 64 + 36 )
= 28 . 100
= 2800
a)
\(86+357+14=\left(86+14\right)+357=100+357=457\)
b)
\(72+69+128=\left(72+128\right)+69=200+69=269\)
c)
\(25.5.4.27.2=\left(25.4\right).\left(5.2\right).27=100.10.27=27000\)
d)
\(28.64+28.36=28.\left(64+36\right)=28.100=2800\)
1.a. 86+357+14 = (86+14)+357 = 100+357 = 457
b. 72+69+128 = (72+128) +69 = 200+69 = 269
c. 25.5.4.27.2 = (25.4).(5.2).27=100.10.27=1000.27=27000
d. 28.64+28.36=28.(64+36)=28.100=2800
2. a. 135+360+65+40= (135+65)+(360+40)=200+400=600
b. 463+318+137+22 = (463+137)+(318+22)=600+340=940
c. = (20+30)+(21+29)+...+(24+26)+25
= 50+50+50+50+25
= 225
a) 86 + 357 + 14 c) 25 x 5 x 4 x 27 x 2
= ( 86 + 14 ) + 357 = ( 25 x 2 ) x ( 5 x 4 ) x 27
= 100 + 357 = 50 x 20 x 27
= 457 = 1000 x 27 = 27000
b) 72 + 69 + 128 d) 28 x 64 + 28 x 36
= ( 72 + 128 ) + 69 = 28 x ( 64 + 36 )
= 200 + 69 = 28 x 100
= 269 = 2800
a) 86 + 357 + 14 b) 72 + 69 + 128
= 357 + ( 86 + 14 ) = 69 + ( 128 + 72 )
= 357 + 100 = 457 = 69 + 200 = 269
c) 25 . 5 . 4 . 27 . 2 d) 28 . 64 + 28 . 36
= ( 25 . 2 ) . ( 5 . 4 ) . 27 = 28 . ( 64 + 36 )
= 50 . 20 . 27 = 27000 = 28 . 100 = 2800
a ) 86 + 357 + 14
= ( 86 + 14 ) + 357
= 100 + 357
= 457
b ) 72 + 69 + 128
= ( 72 + 128 ) + 69
= 200 + 69
= 269
c ) 25 . 5 . 4 . 27 . 2
= ( 25 . 4 ) . ( 5 . 2 ) . 27
= 100 . 10 . 27
= 1000 . 27
= 27000
d ) 28 . 64 + 28 . 36
= 28 ( 64 + 36 )
= 28 . 100
= 2800
Bài 2:
a) \(\left(x-34\right).15=30\)
\(\Rightarrow x-34=2\)
\(\Rightarrow x=36\)
Vậy \(x=36\)
b) \(18\left(x-16\right)=18\)
\(\Rightarrow x-16=1\)
\(\Rightarrow x=17\)
Vậy \(x=17\)
a) 86 + 357 + 14
= (86 + 14) + 357
= 100 + 357
= 457
b) 72 + 69 + 128
= (72 + 128) + 69
= 200 + 69
= 269
c) 25 . 5 . 4 . 27 . 2
= (25 . 4) . (2 . 5) . 27
= 100 . 10 . 27
= 1000 . 27
= 27000
d) 28 . 64 + 28 . 36
= 28 . (64 + 36)
= 28 . 100
= 2800
2. Tìm số tự nhiên x ,biết
a) ( x - 34 ) . 15 = 30
(x - 34) = 30 : 15
(x - 34) = 2
x = 2 + 34
x = 36.
b) 18 . ( x - 16 ) = 18
( x - 16 ) = 18 : 18
( x - 16 ) = 1
x = 1 + 16
x = 17.
c) 5 . 25 . 2 . 16 . 4 = (5 . 2)(25.4) . 16 = 10 . 100. 16 = 16000
35 x 4 = 140
25 x 36 = 900
28 x 25 = 625
36 x 12 = 432
75 x 11 = 825
67 x 101 = 6767
a). 25.5.4.27.2=(25.4).(5.2).27=100.10.27=1000.27=27000
b). 28.64+28.36=28.(64+36)=28.100=2800