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100-200-300-400-500-600-700-800-900-1000=-5300
1000+299-1345-234-345-456-567-678-789-89=-3204
Bài 7: Thực hiện phép tính (tính hợp lí nếu có thể)
a) 78 349 – 10 240 + 56 711
= ( 78 349 + 56 711 ) – 10 240
= 635060 - 10240
= 624820
b) 234. 66 + 54. 80
= 15444 + 4320
= 19760
c) 13. 89 – 43. 17 + 339. 7
= 1157 - 731 + 2373
= (1157 + 2373) - 731
= 3530 - 731
= 2799
d) 2 085 – 1 196 : 26
= 2 085 – 46
= 2039
e) 214. 72 – 45. 214 – 214.27
= 214.( 72 – 45 – 27 )
= 214 . 0
= 0
\(a,=68109+56711=124820\)
\(b,=15444+4320=10764\)
\(c,1157-731+2373=426+2373=2799\)
\(d,=2085-46=2039\)
\(e,214.\left(72-45-27\right)=214.\left(-20\right)=-4200\)
\(g,=8327-1179=7148\)
\(h,=1225-1179=46\)
\(i,2304+1696=4000\)
\(k,=840+30+630=1500\)
\(m,456\left(123+321\right)-256=456.444-256=202464-256=202208\)
a, -(269-357)+(269-357).
=-269+357+269-357.
=0.
b,(123+345)+(456-123)-[2017-(-345)].
=123+345+456-123-2017-345.
=-1561.
a) - ( 269 - 357 ) + ( 269 - 357 )
= - 269 + 357 + 269 - 357
= [( - 269 ) + 269 ] + [(-357) + 357 ]
= 0 + 0
= 0
b) ( 123 + 345 ) + ( 456 - 123 ) - [ 2017 - ( -345 ) ]
= 123 + 345 + 456 - 123 - [ 2017 + 345 ]
= 123 + 345 + 456 - 123 - 2017 - 345
= ( 123 - 123 ) + ( 345 - 345 ) + 456 - 2017
= 0 + 0 + ( - 1561 )
= ( - 1561 )
@ Học tốt @
Nhớ k cho mình nha !!!!! Thank
Trả lời :
a, X + 345 = 456
X = 456 - 345
X = 111
b, 3*X +15 = 45
3*X = 45 - 15
3*X = 30
X = 30 : 10
X = 3
c, 2*[ x-11] = 200
x-11 = 200 : 2
x-11 = 100
x = 100 + 11
x = 111
d, 16+2*X = 30
2*X = 30 - 16
2*X = 14
X = 14 : 2
X = 7
#Study_well..
a) x + 345 = 456
x = 456 - 345
x = 111
b) 3.x + 15 = 45
3.x = 45 - 15
3.x = 30
x = 10
c) 2.(x - 11) = 200
x - 11 = 200 : 2
x - 11 = 100
x = 100 + 11
x = 111
d) 16 + 2.x = 30
2.x = 30 - 16
2.x = 14
x = 7
a) 345 - ( 345 + 77 ) - ( 77 + 23 )
= 345 - 345 - 77 - 77 - 23
= (345-345) - (77+23) - 77
= 0 - 100 - 77
= -100 - 77
= -177
b) 234 + ( 433 - 234 )
= 234 + 433 - 234
= (234-234) + 433
= 0 + 433
= 433
a) 345 - ( 345 + 77 ) - ( 77 + 23 )
= 345 - 345 - 77 - 77 + 23 = -77 - 77 + 23
= -77.2 + 23
= -154 + 23
= -131
b) 234 + (433 - 234)
= 234 + 433 - 234
= (234 - 234) + 433
= 0 + 433
= 433
123+345+456-123-2017-345
= ( 123 - 123 ) + ( 345 - 345 ) - ( 123 + 2017 )
= 0 + 0 - 2140
= -2140
Trả lời :
( 123 + 345 ) + ( 456 - 123 ) - [ 2017 - ( - 345 ) ]
= 123 + 345 + 456 - 123 - 2017 - 345
= 123 + 345 + 456 + ( - 123 ) + ( - 2017 ) + ( - 345 )
= [ 123 + ( - 123 ) ] + [ 345 + ( - 345 ) ] + [ 456 + ( - 2017 ) ]
= 0 + 0 + ( - 1561 )
= - 1561
Hok tốt
( 123 + 345 ) + ( 456 - 123 ) - [ 2017 - (-345) ]
= 123 + 345 + 456 - 123 - 2017 + (-345)
= 123-123+345+(-345)+456-2017
= 0 + 0 + 456 - 2017
= 456 - 2017 = -1561
=123+345+456-123-2017-345
=(123-123)+(345-345)+(456-2017)
=0+0+(-1561)
=-1561
1. 234 + ( 345 - x ) = 500
345 - x = 500 - 234
345 - x = 266
x = 345 - 266
x = 79
2. 456 - ( x + 23 ) = 326
x + 23 = 456 - 326
x + 23 = 130
x = 130 - 23
x = 107
3. ( 567 - x ) . 212 = 605
567 - x = 605 : 212
567 - x = ...
=> Đề sai
4. ( 5 . x - 15 ) : 5 = 0
5 . x - 15 = 0 : 5
5 . x - 15 = 0
5 . x = 0 + 15
5 . x = 15
x = 15 : 5
x = 3
5. 14 x ( x - 7 ) = 210
x - 7 = 210 : 14
x - 7 = 15
x = 15 + 7
x = 22
6. 84 - 4 x ( 2 . x + 1 ) = 48
4 x ( 2 . x + 1 ) = 84 - 48
4 x ( 2 . x + 1 ) = 36
2 . x + 1 = 36 : 4
2 . x + 1 = 9
2 . x = 9 - 1
2 . x = 8
x = 8 : 2
x = 4
1. 345 - x = 500 - 234
345-x=266
x=345-266
x=79
2. x+23 =456-326
x+23=130
x=130-23
x=107
4. 5 x X - 15 =5 x0
5xX -15=0
5 x X = 0+15
5x X = 15
X = 15:5
X =3
5 . x-7 = 210 :14
x - 7 =15
x=15+7
x=22
Ai nhanh mk k nha !!!!!
234 : 13 = 18
=> 243 : 18 = 13
=> 345 : 18 = 19.66666
=> 456 : 18 = 25.333333333