CTR:36/1*3*5+36/3*5*7+36/5*7*9+...+36/25*27*29<3
chứng minh B = 36 / 1 x 3 x 5 + 36 / 3 x 5 x7 + 36 / 5 x 7 x 9 + .... + 36 / 25 x 27 x29 < 3
1.CMR
a) 36^36-9^10 chia het cho 45
b)7^6+7^5-7^4 chia het cho 11
c)81^7-27^9-9^13 chua het cho 45
2.
S=3+3^2+3^3+...+3^199
CMR:S Chia hết cho 12
Hoàn thành các phép tính sau :
7/9+5/12-3/4=7×4/36+5×.../36-3×.../36
=28+..._.../36
=16/36=.../...
1/-7264+ (1543 +7264)
2/ (14497) - 144
3/ (-145) (18 145)
4/ 111 + (-11+27)
5/ (27 +514) - (486-73)
6/ (36+79) + (145-79-36)
7/10 [12-(-9-1)]
8/ (3829 +43) - (43 +38)
9/ 271 [(-43) + 271 − (-17)]
10/-144-[29(+144)-(+144)]
Bài 1:Thực hiện phép tính
a, 1/2×( 2/9 +3/7 - 5/27)
b, (-5/8 + 1,75 + 8/35) : (-3 9 phần 10(hỗn số)
c, 1/3 × 5/7 - 5/27 × 36/14
a) 7/-25+8/25 ; 4/5+4/-18 ; 7/21+9/-36
b) 12/20-2/5 ; 2/3-(-5/6) ; 6-3/20
c)2/21*(-7/3) ; 27/28*(-21) ; -15/7*(-14/25)
ai nhanh mk tk cho giup k nhe minh can gap
Bỏ ngoặc rồi tinh
1/ -7264+(1543+7264)
2/ (144-97)-144
3/(-145)-(18-145)
4/ 111+(-11+27)
5/(27+514)-(486-73)
6/(36+79)+(145-79-36)
7/10-[12-(-9-1)]
8/(38-29+43)-(43+38)
9/271-[(-43)+271-(-17)]
10/-144-[29-(+144)-(+144)]
5×36^9×4^6-2×12^14×3^6÷5×2^28×3^19-7×2^29×3^18
