19*4*10*30+12+45-12+-13/3*17*89*4411
16*59*45*78+45--12+45-78-36
1+2+3+4+5+6+7+7+8+9+10+11+12+13+14+45+15+16+17+18+19+20+21-56+56+48+52+78+84+54+2545+455+1454+1256-23+56+586=
1+2+3+4+....-56+56+48.......-23+56+586=6928
89*45
78*45
12 mũ 2
kb nha
89*45=4005
78*45=3510
12^2=144
#Chúc bạn học tốt nhé
\(89\times45=4005\)
\(78\times45=3510\)
\(12^2=144\)
Học tốt ^.^
89.45=4005
78.45=3510
122=144
k cho mk nha
hok tốt
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 * 55 * 56 * 57 * 58 * 59 * 60 * 61 * 62 * 63 * 64 * 65 * 66 * 67 * 68 * 69 * 70 * 71 * 72 * 73 * 74 * 75 * 76 * 77 * 78 * 79 * 80 * 81 * 82 * 83 * 84 * 85 * 86 * 87 * 88 * 89 * 90 * 91 * 92 * 93 * 94 * 95 * 96 * 97 * 98 * 99 * 100 bằng bao nhiêu?
`(-134)+51.134+(-134).48
124+(-52).124+(-124).(-47)
-55.78+13.(-78)-78.(-65)
45.(-24)+(-10).(-12)
12*23*34*45*56*67*78*89
12 * 23 * 34 * 45 * 56 * 67 * 78 * 89 = 10 998 867 035 520
tk mk nha
hihi yêu mọi người nhiều lắm đấy
=10998867035520 nha nhunge mà hơi to
12+23+34+45+56+67+78+89=?
Câu hỏi :
12 + 23 + 34 + 45 + 56 + 67 + 78 + 89 = ?
Trả lời :
12 + 23 + 34 + 45 + 56 + 67 + 78 + 89 = 404
Chúc bạn học tốt !
12 + 23 + 34 + 45 + 56 + 67 + 78 + 89
= ( 12 + 89 ) + ( 23 + 78 ) + ( 34 + 67 ) + ( 45 + 56 )
= 101 + 101 + 101 + 101
= 101 x 4
= 404.
Tính hợp lí :
1. 35.18-5.7.28
2/ 45-5.(12+9)
3/ 24.(16-5)-16.(24-5)
4/ 29 . (19--13) -19 . (29-13)
5/ 31. (-18) + 31 . (-81) - 31
6 / ( -12) . 47 + ( -12 ) . 52 + (-12)
7/ 13 .( 23 + 22 ) - 3. ( 17 + 28)
8/ -48 + 48 . ( -78 ) + 48 . (-21)
1) \(35.18-5.7.28=35.18-35.28=35\left(18-28\right)=-350\)
2) \(45-5\left(12+9\right)=45-60-45=-60\)
3) \(24\left(16-5\right)-16\left(24-5\right)=24.16-24.5-16.24+16.5=5\left(16-24\right)=5.8=40\)
4) \(29\left(19-13\right)-19\left(29-13\right)=29.19-29.13-19.29+19.13=13\left(19-29\right)=-130\)
5) \(31.\left(-18\right)+31.\left(-81\right)-31=-31.\left(18+81+1\right)=-3100\)
6) \(\left(-12\right).47+\left(-12\right).52+\left(-12\right)=\left(-12\right)\left(47+52+1\right)=-1200\)
7) \(13\left(23+22\right)-3\left(17+28\right)=13.45-3.45=45.\left(13-3\right)=450\)
8) \(-48+48.\left(-78\right)+48.\left(-21\right)=-48\left(1+78+21\right)=-4800\)
Bài 1: Tính hợp lý
1/ 35.18-5.7.28
2/ 45-5.(12+9)
3/ 24.(16-5)-16.(24-5)
4/ 29.(19-13)-19.(29-13)
5/ 31.(-18)+31.(-81)-31
6/ (-12).47(-12).52+(-12)
7/ 13.(23+22)-3.(17+28)
8/ -48+48.(-78)+48.(21)
1, 35 . 18 - 5 . 7 . 28
= 35 . 18 - 35 . 28
= 35 . ( 18 - 28 )
= 35 . ( -10 )
= -350
2, 45 - 5 . ( 12 + 9 )
= 40 . 21
= 840
3, 24 . ( 16 - 5 ) - 16 . ( 24 - 5 )
= 24 . 11 - 16 . 19
= 264 - 304
= -40
1+12+23+34+45+56+67+78+89
1 + 12 + 23 + 34 + 45 + 56 + 67 + 78 + 89
= (1 + 89) + (12 + 78) + (23 + 67) + (34 + 56) + 45
= 90 + 90 + 90 + 90 + 45
= 90 x 4 + 45
= 360 + 45
= 405