1=3
2=8
3=12
4=16
5=26
6=32
7=43
8=59
hỏi 9=?
438 + 83 = ?
18 + 932 = ?
438+83 = 521
18+932= 950
chúc bạn học tốt nhé
\(438+83=521\)
\(18+932=950\)
hok tốt
(-165).83+(-17).165-35.100
15+48+194+165+152+124...+124+12+7456+12=12978
a ) A = ( 5,05 : \(\dfrac{1}{40}\) - 2,8 \(\times\) \(\dfrac{5}{6}\) )
b ) B = -66 .(\(\dfrac{1}{2}\) - \(\dfrac{1}{3}\) + \(\dfrac{1}{11}\) ) + 124 . (-17) + 83 . (-124)
a) a = \(\dfrac{599}{3}\)
b) B = -12417
1
a)34×35+35×86+65×75+65×45
b)652+327+148+15+73
c)341×67+341×16+659×83
d)13+15+17+...+199
2
a)32×(x-10)=64
b)461-(x-45)=387
c)(2×x+15)+342=1517
so sánh :
3/124 ; 1/41 : 5/207 ;2/83
a) 185 + 434+ 515 + 266 + 155
b) 652 + 327 + 148 + 15 + 73
c) 5 . 125 . 2 . 1 . 8
d) 8.12.125.2
e) 3.25.8.+4.37.6+2.38.12
a) 185+434+515+266+155 = (185+515)+(434+266)+155
= 700+700+155 = 1555
b. (652+148)+(327+73)+15=800+400+15=1215
c. (125*8)*(5*2)*1=1000*10*1=10000
d. (125*8)*(12*2)=1000*24=24000
e.3*25*4*2+4*37*6+2*38*12=600+888+912=2400
mik ik mik til lại cko nha! mấy bạn
a) 185 + 434+ 515 + 266 + 155
=(185+515)+(434+266)+155
=700+700+155
=1400+155
=1555
b) 652 + 327 + 148 + 15 + 73
=(652+147)+(327+73)+15
=800+400+15
=1215
c) 5 . 125 . 2 . 1 . 8
=10.1000
=10000
d) 8.12.125.2
=24.1000
=24000
e) 3.25.8.+4.37.6+2.38.12
=24.(25+37+38)
=24.100
=2400
Tính
a)\(\sqrt{1\frac{9}{16}\times2\frac{14}{25}}\) b)\(\sqrt{\frac{25^2-9^2}{68}}\) c)\(\sqrt{\frac{165^2-124^2}{21^2-20^2}}\)
a) \(\sqrt{1\frac{9}{16}\times2\frac{14}{25}}=\sqrt{\frac{25}{16}\times\frac{64}{25}}=\sqrt{4}=2\)
b) \(\sqrt{\frac{25^2-9^2}{68}}=\sqrt{\frac{\left(25-9\right)\left(25+9\right)}{68}}=\sqrt{\frac{16.34}{68}}=\sqrt{8}\)
tìm x
a)480:x+124:x =4
b)327:x-112:x=5
ai nhanh mình tick cho
a)480:x+124:x =4
(480+124):x=4
604:x=4
x=604:4
x=151
b)327:x-112:x=5
(327-112):x=5
215:x=5
x=215:5
x=43
a) 480 : x + 124 : x = 4
x : ( 480 + 124 ) = 4
x : 604 = 4
x = 2416
b) 327 : x - 112 : x = 5
x : ( 327 - 112 ) = 5
x : 215 : 5
x = 1075
Thuc hien phep tinh:
a.3/7.11/15+3/7:15/14+2/7
b.(-7/15).5/8.15/-7(-32)
c.[(1/9:8/27):-1/3]:81/128
d.-66(1/2-1/3+1/11)+124(-37)+63(-124)