2 = 6
3 = 12
4 = 20
5 = 30
6 = 42
9 = ??
Tính:
a) 58 . 53 + 32 . 33 . 30
b) 465 : { 306 + [ 63 + ( 47 - 35 ) . 23 ]}
c) 2 . 18 . 12 + 3 . 17 . 12 + 4 .69 . 9
Giúp mk với!
Tính:
a) 58 . 53 + 32 . 33 . 30
= 511 + 35 . 1
=48828125+ 243 . 1
=48828125+ 243
= 48828368.
b) 465 : { 306 + [ 63 + ( 47 - 35) . 23 ]}
= 465 : { 306 + [ 63 + 12 . 23]}
= 465 : { 306 + [ 63 + 12 . 8]}
= 465 : {306 + [ 63 + 96 ]}
= 465 : { 306+ 159 }
= 465 : 465
= 1.
c) 2 . 18 . 12 + 3 . 17 .12 + 4 . 69 . 9
= 36 . 12+ 51 . 12 + 4 . 69 .9
= 432 + 612 + 621
= 1044 + 621
= 1665.
Đây là câu trả lời của mik, mik ko pjt đúng hay sai, nếu mik đúng, tick nha! Nếu mik sai, bn nhắc mik nghen!^^
Tính:
a) 58 . 53 + 32 . 33 . 30
b) 465 : { 306 + [ 63 + ( 47 - 35 ) . 23 ]}
c) 2 . 18 . 12 + 3 . 17 . 12 + 4 . 69 . 9
Giúp mk với!
a, 5^8 . 5^3 + 3^2 . 3^ 3 . 3^0
= 5^11 + 2^5 . 1
= 5^11 + 2^5
b, 465 : { 306 + [ 63 + ( 47 - 35 ) . 2^3
= 405 : { 306 + [ 63 + 12 . 8 ]
= 405 : { 306 + 63 + 96 }
= 405 : 405
= 1
c, 2 . 18 . 12 + 3 . 17 . 12 + 4 . 69 . 9
= 36 . 12 + 51 . 12 + 276 . 9
= 432 + 612 . 12 + 2484
= 432 + 7344 + 2484
= 7776 + 2484
= 10260
Tính:
a) 58 . 53 + 32 . 33 . 30
b) 465 : { 306 + [ 63 + ( 47 - 35 ) . 23 ]}
c) 2 .18 . 12 + 3 . 17 . 12 + 4 . 69 . 9
Bạn nào giúp mình mình kick cho!
a) 58 . 53 + 32 . 33 . 30
= 511 + 35
= .... ( tự tính )
b) 465 : { 306 + [ 63 + ( 47 - 35 ) . 23 ]}
= 465 : { 306 + [ 63 + 12 . 23 ] }
= 465 : { 306 + [ 63 + 12 . 8 ] }
= 465 : { 306 + [ 63 + 96 ] }
= 465 : { 306 + 159 }
= 465 : 465
= 1
c) 2 .18 . 12 + 3 . 17 . 12 + 4 . 69 . 9
= 2 . 18 . 12 + 3 . 17 . 12 + 4 . 3 . 23 . 9
= 2 . 18 . 12 + 3. 17 . 12 + 12 . 23 . 9
= 12 . ( 2 . 18 + 3 . 17 + 23 . 9 )
= 12 . 294
= 3528
90:9=
12:12=
63:6=
42:7=
Câu trả lời của mình nè:
90:9=19;
12:12=1;
63:6=10,5;
42:7=6; Đúng 100%
90 : 9 = 10
12 : 12 = 1
63 : 6 = 10 ( dư 3 )
42 : 7 = 6
Ủng hộ mk nha
90:9=10
12:12=1
63:6=10.5
42:7=6
tui làm trước
k) 2345 – 1000 : [19 – 2(21 – 18)2 ] l) 128 – [68 + 8(37 – 35)2 ] : 4
m) 568 – {5[143 – (4 – 1)2 ] + 10} : 10
n) 107 – {38 + [7.32 – 24 : 6+(9 – 7)3 ]}:15
o) 307 – [(180 – 160) : 22 + 9] : 2
p) 205 – [1200 – (42 – 2.3)3 ] : 40
q) 177 :[2.(42 – 9) + 32 (15 – 10)]
r) [(25 – 2 2 .3) + (32 .4 + 16)]: 5
s) 125(28 + 72) – 25(32 .4 + 64)
giúp mk
s: \(=125\cdot100-25\cdot192\)
\(=12500-4800\)
=7700
Bài 1:Tìm x, biết:
a, (x-15):50+22=24
b, 42-(2x+32)+12:2=6
c,134-2{156-6.[54-2.(9+6)]}.x=86
bài 2:tìm x, biết
a,120:[21-(4x-4)]=23.3
b,3.[205-(x-9)]-486=0
c,204-2{200-5.[64-2.(11+6)]}.x=4
a,\(\left(x-15\right):50+22=24\)
\(< =>\frac{\left(x-15\right)}{50}=2< =>x-15=100\)
\(< =>x=100+15=115\)
b,\(42-\left(2x+32\right)+12:2=6\)
\(< =>42-2x-32=0\)
\(< =>10-2x=0< =>x=\frac{10}{2}=5\)
Làm nốt :
c) \(134-2\left\{156-6\cdot\left[54-2\cdot\left(9+6\right)\right]\right\}\cdot x=86\)
=> 134 - 2{156 - 6 . [54 - 2 . 15]} . x = 86
=> 134 - 2{156 - 6 . [54 - 30]} . x = 86
=> 134 - 2{156 - 6. 24} . x = 86
=> 134 - 2{156 - 144} . x = 86
=> 134 - 2.12 . x = 86
=> 134 - 24 . x = 86
=> 24.x = 48
=> x = 2
Bài 2 : a) 120 : [21 - (4x - 4)] = 23.3
=> 120 : [21 - (4x - 4)] = 8.3
=> 120 : [21 - (4x - 4)] = 24
=> 21 - (4x - 4) = 5
=> 4x - 4 = 16
=> 4x = 20
=> x = 5
b) 3.[205 - (x - 9)] - 486 = 0
=> 3.[205 - (x - 9)] = 486
=> 205 - (x - 9) = 162
=> x - 9 = 205 - 162 = 43
=> x = 43 + 9 = 52
c) 204 - 2{200 - 5.[64 - 2.(11 + 6)]} . x = 4
=> 204 - 2{200 - 5.[64 - 2.17]} . x = 4
=> 204 - 2{200 - 5 .[64 - 34]}.x = 4
=> 204 - 2{200 - 5.30} . x = 4
=> 204 - 2{200 - 150}.x = 4
=> 204 - 2.50 . x = 4
=> 2.50.x = 200
=> 100.x = 200
=> x = 2
{5.[42:(5x3+50:10)x3:2+4]} + {35.[63:9.(52)]}
ai trả lời nhanh mik tick
\(\left\{5.\left[42:\left(5.3+50:10\right).3:2+4\right]\right\}+\left\{35.\left[63:9.\left(5^2\right)\right]\right\}\\ =\left\{5.\left[42:\left(15+5\right).1,5+4\right]\right\}+\left\{35.\left(9.25\right)\right\}\\ =\left\{5.\left[42:20.1,5+4\right]\right\}+\left\{35.225\right\}\\ =\left\{5.\left[2,1.1,5+4\right]\right\}+7875\\ =\left\{5.\left[3,15+4\right]\right\}+7875\\ =\left\{5.7,15\right\}+7875\\ =35,75+7875\\ =7910,75\)
{5.[42:(5.3+50:10).3:2+4]}+{35.[63:9.(52)]}={5.[42:(15+5).1,5+4]}+{35.(9.25)}={5.[42:20.1,5+4]}+{35.225}={5.[2,1.1,5+4]}+7875={5.[3,15+4]}+7875={5.7,15}+7875=35,75+7875=7910,75
{5.[42:(5.3+50:10).3:2+4]}+{35.[63:9.(52)]}
={5.[42:(15+5).1,5+4]}+{35.(9.25)}
={5.[42:20.1,5+4]}+{35.225}
={5.[2,1.1,5+4]}+7875={5.[3,15+4]}+7875
={5.7,15}+7875
=35,75+7875
=7910,75
1)Tính:
a) A=1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90
b) B=(3/4)(8/9)(15/16)(24/25)(35/36)(48/49)(63/64)
c) C=1/4+1/12+1/36+1/108+1/324+1/92
\(\frac{1}{2}+\frac{5}{6}+\frac{11}{12}+\frac{19}{20}+...+\frac{89}{90}\)
\(=1-\frac{1}{2}+1-\frac{1}{6}+1-\frac{1}{12}+1-\frac{1}{20}+...+1-\frac{1}{90}\)
\(=9-\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{90}\right)\)
\(=9-\left(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{9.10}\right)\)
\(=9-\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+....+\frac{1}{9}-\frac{1}{10}\right)\)
\(=9-\left(1-\frac{1}{10}\right)\)
\(=9-\frac{9}{10}=\frac{81}{10}\)
Bài 6 : Tính hợp lí
1 . (-232)+55+(-63)+45
2 . (-205)+21+205+75
3 . 131+269+(-59)+(-131)
4 . (-196)+189+20+(-604)+(-199)
5 . (-170)+43+(-143)
6 . (-43)+(-17)+(-25)
7 . (-249)+121+I-29I+(-121)
8 . (-47)+(-139)+47+169
9 . (-13)+(-7)+(-75)
10 . (-9)+37+(-11)
11 . 12+(-23)+53
12 . (-3)+(-25)+23
13 . (-26)+10+(-14)
14 . (-13)+6+(-37)+14
15 . (-11)+(-9)+5+25
16 . (-12)+(-18)+8
17 . 315+[135+(-315)+(-35)]
18 . 815+[95+(-915)+(-45)]
19 . 5+(-7)+9+(-11)+13+(-15)
20 . (-10)+12+(-14)+16+(-18)+20