-129 - 72 - (-29) + (-28) + 2017
THỰC HIỆN PHÉP TÍNH
a)-129-72-(-29)+(-28)+2017
b)(-35).37-37.5+(-37).60
a,- 129 - 72 -( - 29 ) + ( - 28 ) + 2017
= - 200 +2017
= 1817
b, ( - 35 ) . 37 - 37 . 5 + ( - 37 ) . 60
= - 1295 - 185 + ( - 2220 )
= - 3700
bài1 tính hợp lý nếu có thể
a, ( -68 ) + (-72) + 2017 + (-28) + 168
b, | -28| + ( 129-182+99) - (129+ 199 -182 )
c, 17. (-83) + 18 . 83
d, 2018 0 -{ 152 : [ 175 + ( 23 . 52 - 6. 25) ] }
a)
\(-68+\left(-72\right)+2017+\left(-28\right)+168.\)
\(=\left(-68+168\right)+\left(-28-72\right)+2017.\)
\(=\left(168-68\right)+\text{ }\left[-\left(72+28\right)\right]+2017.\)
\(=100+\left(-100\right)+2017.\)
\(=100-100+2017.\)
\(=2017\)
b)
\(\left|-28\right|+\left(129-182+99\right)\)\(-\left(129+199-182\right)\)
\(=28+129-182+99\)\(-129-199+182.\)
\(=28+\left(129-129\right)+\left(182-182\right)\)\(-\left(199-99\right)\)
\(=28+0+0-100.\)
\(=-\left(100-28\right)\)
\(=-72\)
c)
\(17\left(-83\right)+18\times83.\)
\(=-17\left(83\right)+18\left(83\right)\)
\(=83\left[18+\left(-17\right)\right]\)
\(=83\left(18-17\right)\)
\(=83\left(1\right)\)
\(=83\)
d)
\(2018^0-\left(15^2\div\left[175+\left(2^3\times5^2-6\times25\right)\right]\right).\text{ }\)
\(=1-\left(15^2\div\left[175+\left(8\times25-6\times25\right)\right]\right)..\)
\(=1-\left(15^2\div\left[175+\left(25\left[8-6\right]\right)\right]\right)\)
\(=1-\frac{15^2}{175+\left(25\times2\right)}.\)
\(=1-\frac{15^2}{175+50}\)
\(=1-\frac{225}{225}\)
\(=1-1\)
\(=0\)
Học tốt
Tính nhanh:
28*47+28*43+72*29+72*61
28 x 47 + 28 x 43 + 72 x 29 + 72 x 61
= 28 x ( 47 + 43 ) + 72 x ( 29 + 61)
= 28 x 90 + 72 x 90
= 90 x ( 28 + 72)
= 90 x 100
= 9 000
k mk nha
28 x 47 + 28 x 43 + 72 x 29 + 72 x 61
= 28 x (47 + 43) + 72 x (29 + 61)
= 28 x 90 + 72 x 90
= (28 + 72) x 90
= 100 x 90 = 9000
28 x 47 + 28 x 43 + 72 x 29 + 72x 61
= 28( 47 + 43 ) + 72 x ( 61+ 29)
=28 x 90 + 72 x 90
= 90 x (28 + 72 )
= 90 x 100 = 9000
Tính nhanh:
a, 271-214+129+!4
b,-29+(-37)-(-129)-163
c,43.267-(-43).(-367)
d,(-5).17.6+30.117
e,39.(-28+59)-59.(39-28)
(-68) + (-72) + 2017 +(-28) +168
(-68) + (-72) + 2017 +(-28) +168= -(68+72+28)+2017+168=(-168)+2017+168=2017
1 Tính hợp lý nếu có thể
a (-68)+(-72)+2017+(-28)+168
b |-28|+(129-182+99)-(129+199-182)
c 17 * (-83)+18*23
d 2018 mũ 0 - (15 mũ 2/(175+(2mux 3 * 5 mũ 2 - 6 * 25)))
bài 2
a (111-x)+ 7 mũ 2 = 149
b |x| +18 = 163+(-45)
c 7 mũ x-4 * 6 = 2058
d 84 chia hết x, 126 chia hết và 7 <x<hoặc bằng 21
Các bạn giải hết họ mk nha khoảng 6 h mình sẽ lấy k quả
a) (-68) + (-72) + 2017 + (-28) + 168
= (-68 + 168) + [(-72) + (-28)] + 2017
= 100 + (-100) + 2017
= 0 + 2017
= 2017
Câu hỏi khác của Nguyễn Minh Anh
b) |-28| + (129 - 182 + 99) - (129 + 199 - 182)
= 28 + 129 - 182 + 99 - 129 - 199 + 182
= (129 - 129) - (182 - 182) + (99 - 199) + 28
= 0 - 0 + (-100) + 28
= -72
a) 2011 + 5[300 – (17 – 7)2]
b) 695 – [200 + (11 – 1)2]
c) 129 – 5[29 – (6 – 1)2]
2010 – 2000 : [486 – 2(72 – 6)]
a: \(=2011+5\cdot\left[300-10^2\right]\)
\(=2011+5\cdot200\)
=1011
b: \(=695-\left[200+10^2\right]\)
=695-300
=395
a) =2011+5.200
=3011
b)=695-300
=395
c)1=29-5.4
=109
d)=2010-2000:400
=2010-5
=2005
28.(29+69)+72.(80+68)
28.98+72.148
=2744+10656
=21312
28.(29+69)+72.(80+68)
= 28. 98 + 72 .148
=
=28.98+72.148
=98.148.(28+72)
=98.148.100
=98.14800
=1450400
a) 19 . 25 + 19 . 16 + 41
b) (-8) . 72 + 8 . (-19)- (-8)
c) 28 +(19 - 28 ) - ( 32 - 57)
d) 101 + (- 60) + 29 + (- 40)