4.52-3.2+ 33 chia 32
150 chia [25.(18-42)]
125+ 70+ 375+ 230
s=1+ 3+ 5 ......99
315-64 chia 32 ; 22.32+ 4.32
6x-5=31 ;2.14.(x-5)=28
a,4.52-3.2+33: 32=
b,150: [25.( 18-42 )=
c,s=1+3+5....99=
d,125+70+375+230=
e,315-64:23=
f,6x-5=31=
g,2.14.(x-5)=28=
giup minh voi
a,4.52-3.2+ 33 : 32= 4* 5^2 - 3*(2+1)= 100 - 9 = 91
b,150: [25.( 18-42 )= 150 : (25 * 2) = 3
c,S=1+3+5....99
= (1+99) +(3+ 97) +....+ (47 + 53) + (49 + 51)
= 100 * 25
= 2500
d,125+70+375+230= (125+ 375) +(70 + 230) = 500 + 300 = 800
e,315-64:23 = 135 -8 = 127
f,6x-5=31
6x = 36
x=6
g,2.14.(x-5)=28
28 (x-5) = 28
x-5 =1
x=6
a,4.52-3.2+33: 32=97
b,150: [25.( 18-42 )=3
c,s=1+3+5....99=2500
d,125+70+375+230=800
e,315-64:23=307
f,6x-5=31=>x=6
g,2.14.(x-5)=28=>x=6
cik cho mik nha bn!
Bài 1. Thực hiện các phép tính sau:
a) 12 : { 400 : [500 – (125 + 25 . 7)]}
b) 5 . 22 – 18 : 3
c) 18 : 3 + 182 + 3.(51 : 17)
d) 25 . 8 – 12.5 + 170 : 17 – 8
e) 2.52+ 3: 710 – 54: 33
f) 189 + 73 + 211 + 127
g) 375 : {32 – [ 4 + (5. 32– 42)]} – 14 )
h) (52022 + 52021) : 52021
a, mk làm kết quả lun.
=12:{400:[500-(125+175)]}
=12:{400:[500-300]}
=12:{400:200}
=12:2
=6
b,
=110-18:3
= 110-6
=104
k mk nha. k xong mk làm tiếp. dài quá nhưng cx dễ
Tính nhanh:
a.18 mũ 3 chia 9 mũ 3.
b.125 mũ 3 chia 25 mũ 8.
c.mở ngoặc 10mũ 3 cộng 10 mũ 4 cộng 125 mũ 2 đóng ngoặc chia 5 mũ 3.
d.24 mũ 4 chia 3 mũ 4 trừ 32 mũ 12 chia 16 mũ 12.
a,183:93=(18-9)3=729
b,còn lại tự làm ,làm mẫu đến đây thôi
l.i.k.e cho mình nha Nguyen vu dang nguyen
[x cộng 32 ] - 17 .2 = 42
575- [6x cộng 70 ] =25
315 cộng [ 125 -x] = 435
[x -105] chia 21 = 15
[ 61 cộng [ 51 -x ] . 17 = 1785
575-[6x+60]=25
[6x+60]=575-25
[6x+60]=550
suy ra:
6x+60=550 hoặc 6x+60=-550
6x =550-60 6x =-550-60
6x =490 6x =-610
vậy...
[x+32]-17.2=42
[x+32]-17 =42:2
[x+32]-17 =21
[x+32] =21+17
[x+32] =28
suy ra:
x+32=28 hoặc x+32=-28
x =28-32 x =-28-32
x =-4 x =-60
315+[125-x]=435
[125-x]=435-315
[125-x]=120
suy ra:
125-x=120 hoặc 125-x=-120
x=125-120 x=125-(-120)
x=5 x=245
vậy...
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50+51+52+53+54+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70=?
1. Tính hợp lí nếu có thể :
a) 125 + 80 + 375 + 220
b) 25.11.8.4.125
c) 18.74 + 18.27 - 18
d) 75 . 23 + 75 . 77 - 500
e) 150 : [25.(18-42)]
f) 125 . 23 . 2 . 8 . 50
g) 235 + 88 + 165 + 12
h) 71 . 32 + 71 . 68 - 1100
i) 67 : 66 + 43 .2 - 240
j) 546 - 6. [158 : (30 + 72)]
k) 268 + 147 + 132 + 253
2. Tìm số tự nhiên x, biết :
a) 7 . x = 707
b) 6x + 5 = 47
c) 35 : (x+1) = 7
d) 12 + (29 - 3x) = 35
e) 2.4x + 101 = 138
f) 7 . x = 140
g) 7 . (15 - x) + 14 = 84
h) 3x . 5 - 15 = 390
3. Tìm số tự nhiên n , biết :
(n+11) chia hết cho (n+1)
1.
a) \(125+80+375+220\)
\(=\left(125+375\right)+\left(80+220\right)\)
\(=500+300\)
\(=800\)
b) \(25.11.8.4.125\)
\(=\left(25.4\right).\left(8.125\right).11\)
\(=100.1000.11\)
\(=1100000\)
c) \(18.74+18.27-18\)
\(=18.\left(74+27-1\right)\)
\(=18.100\)
\(=1800\)
d) \(75.23+75.77-500\)
\(=75.\left(23+77\right)-500\)
\(=75.100-500\)
\(=7500-500\)
\(=7000\)
e) \(150:\left[25.\left(18-4^2\right)\right]\)
\(=150:\left[25.\left(18-16\right)\right]\)
\(=150:\left[25.2\right]\)
\(=150:50\)
\(=3\)
f) \(125.23.2.8.50\)
\(=\left(125.8\right).\left(2.50\right).23\)
\(=1000.100.23\)
\(=2300000\)
g) \(235+88+165+12\)
\(=\left(235+165\right)+\left(88+12\right)\)
\(=400+100\)
\(=500\)
h) \(71.32+71.68-1100\)
\(=71.\left(32+68\right)-1100\)
\(=71.100-1100\)
\(=7100-1100\)
\(=6000\)
i) \(6^7:6^6+4^3.2-24^0\)
\(=6+64.2-1\)
\(=6+128-1\)
\(=133\)
j) \(546-6.\left[158:\left(30+7^2\right)\right]\)
\(=546-6.\left[158:\left(30+49\right)\right]\)
\(=546-6.\left[158:79\right]\)
\(=546-6.2\)
\(=546-12\)
\(=534\)
k) \(268+147+132+253\)
\(=\left(268+132\right)+\left(147+253\right)\)
\(=400+400\)
\(=800\)
2.
a) \(7x=707\)
\(x=707:7\)
\(x=101\)
b) \(6x+5=47\)
\(6x=47-5\)
\(6x=42\)
\(x=42:6\)
\(x=7\)
c) \(35:\left(x+1\right)=7\)
\(x+1=35:7\)
\(x+1=5\)
\(x=5-1\)
\(x=4\)
d) \(12+\left(29-3x\right)=35\)
\(29-3x=35-12\)
\(29-3x=23\)
\(3x=29-23\)
\(3x=6\)
\(x=6:3\)
\(x=2\)
e) \(2.4^x+10^1=138\)
\(2.4^x=138-10\)
\(2.4^x=128\)
\(4^x=128:2\)
\(4^x=64=4^3\)
\(\Rightarrow x=3\)
f) \(7x=140\)
\(x=140:7\)
\(x=20\)
g) \(7\left(15-x\right)+14=84\)
\(7\left(15-x\right)=84-14\)
\(7\left(15-x\right)=70\)
\(15-x=70:7\)
\(15-x=10\)
\(x=15-10\)
\(x=5\)
h) \(3^x.5-15=390\)
\(3^x.5=390+15\)
\(3^x.5=405\)
\(3^x=405:5\)
\(3^x=81=3^4\)
\(\Rightarrow x=4\)
3.
Ta có:
\(\Rightarrow n+11⋮n+1\)
\(\Rightarrow n+1+10⋮n+1\)
\(\Rightarrow10⋮n+1\) hay \(n+1\inƯ\left(10\right)=\left\{-10;-5;-2;-1;1;2;5;10\right\}\)
\(\Rightarrow\) \(n\in\left\{-11;-6;-3;-2;0;1;4;9\right\}\)
Vì \(n\in N\) nên \(n\in\left\{0;1;4;9\right\}\)
Bài 1. Thực hiện các phép tính sau:
a) 12 : { 400 : [500 – (125 + 25 . 7)]}
b) 5 . 22 – 18 : 3
c) 18 : 3 + 182 + 3.(51 : 17)
d) 25 . 8 – 12.5 + 170 : 17 – 8
e) 2.52+ 3: 710 – 54: 33
f) 189 + 73 + 211 + 127
g) 375 : {32 – [ 4 + (5. 32– 42)]} – 14 )
h) (52022 + 52021) : 52021
a) 12 : { 400 : [500 – (125 + 25 . 7)]}
=12 : { 400 : [500 – (125 + 175)]}
=12 : [ 400 : [500 – 300)]
=12 : (400:200)
=12:2=6
b) 5 . 22 – 18 : 3
=5.4-6
=20-6=14
c) 18 : 3 + 182 + 3.(51 : 17)
=5+182+3.3
=187+9=196
d) 25 . 8 – 12.5 + 170 : 17 – 8
=200-60+10-8
=142
e) 2.52+ 3: 710 – 54: 33
=2.25+3:1-54:27
=50+3-2
=51
f) 189 + 73 + 211 + 127
=(189+211)+(73+127)
=400+200=600
g) 375 : {32 – [ 4 + (5. 32– 42)]} – 14 )
=375 : {32 – [ 4 + (160– 42)]} – 14 )
=375 : [32 – ( 4 + 118) – 14 ]
=375:(32-122-14)
=375:-104
=-375/104
h) (52022 + 52021) : 52021
=(52022:52021)+(52021:52021)
=5+1=6
60 chia 8 nhân 2,6
( 75 cộng 45 ) chia 75
480 chia 125 chia 4
2001 chia 25 trừ 1999 chia 25
bài 1 Tính
bài 2 Tính bằng 2 cách
64 chia 5 cộng 36 chia 5
Bài 1.Thực hiện các phép tính sau:a)217 320 : 4;
b) 5025:5-25:5 ;
c) 218-180:2:9 ;
d)(328-8):32
Bài 2.Thực hiện phép tính.a) 27 . 75 + 25 . 27 –150
b)12 : { 400 : [500 –(125 + 25 . 7)]}
c) 13 . 17 –256 : 16 + 14 : 7 –1
d) 18 : 3 + 182 + 3.(51 : 17)
ko có bài 3 nhé!!
Bài 4.Thực hiện phép tínha) 375 : {32 –[ 4 + (5. 32–42)]} –14
b) {210 : [16 + 3.(6 + 3. 22)]} –3
Bài 1: Thực hiện các phép tính sau:
\(a)\)Chưa rỏ đề
\(b)\)\(5025\div5-25\div5\)
\(=\)\(1005-5\)
\(=\)\(1000\)
\(c)\)\(218-180\div2\div9\)
\(=\)\(218-10\)
\(=\)\(208\)
\(d)\)\(\left(328-8\right)\div32\)
\(=\)\(320\div32\)
\(=\)\(10\)
Bài 1:
a) ( Tôi không nhìn rõ đầu bài )
b) 5025 : 5 - 25 : 5
= ( 5025 - 25 ) : 5
= 5000 : 5
= 1000
c) 218 - 180 : 2 : 9
= 218 - 180 : ( 2 . 9 )
= 218 - 180 : 18
= 218 - 10
= 208
d) ( 328 - 8 ) : 32
= 320 : 32
= 10
Bài 2: Thực hiện phép tính:
\(a)\)\(27.75+25.27-150\)
\(=\)\(27.\left(75+25\right)-150\)
\(=\)\(27.100-150\)
\(=\)\(2700-150\)
\(=\)\(2550\)
\(b)\)\(12\div\left\{400\div\left[500-\left(125+25.7\right)\right]\right\}\)
\(=\)\(12\div\left\{400\div\left[500-\left(125+175\right)\right]\right\}\)
\(=\)\(12\div\left\{400\div\left[500-300\right]\right\}\)
\(=\)\(12\div\left\{400\div200\right\}\)
\(=\)\(12\div2\)
\(=\)\(6\)
\(c)\)\(13.17-256\div16+14\div7-1\)
\(=\)\(221-16+2-1\)
\(=\)\(206\)
\(d)\)\(18\div3+182+3.\left(51\div17\right)\)
\(=\)\(6+182+3.3\)
\(=\)\(6+182+9\)
\(=\)\(197\)