1 2 + − 1 2 + − 2 3 + 2 3 + 3 4 + − 3 4 + − 4 5 + 4 5 + 5 6 + − 5 6 = 0

1 2 + − 1 2 + − 2 3 + 2 3 + 3 4 + − 3 4 + − 4 5 + 4 5 + 5 6 + − 5 6 = 0

Đây nha

256,23 + 12,56 = 268,79

56,23 + 12,45 = 68,68

89,67 - 23,45 = 66,22

1,23 + 34,67 = 35,9

19,56 + 45,65 = 65,21

kp voi : http://olm/thanhvien/gop123 va mih dj

Lời giải chi tiết:

38 < 83

45 + 23 > 45 – 24

12 + 37 = 37 + 12

56 – 0 = 56 + 0

38 < 83

45 + 23 > 45 -24

12 +37 = 37+12

56-0=56+0

a) 5 13 + − 5 7 + − 20 41 + 8 13 + − 21 41 = 5 13 + 8 13 + − 20 41 + − 21 41 + − 5 7 = − 5 7

b) 1 28 + − 1 14 + 3 28 + − 1 7 + 3 14 = 1 28 + 3 28 + − 1 14 + 3 14 + − 1 7 = 1 7

c)  1 2 + − 2 3 + 3 4 + − 4 5 + 5 6 + − 5 6 + 4 5 + − 3 4 + 2 3 + − 1 2 = 1 2 + − 1 2 + 3 4 + − 3 4 + − 4 5 + 4 5 + 5 6 + − 5 6 = 0

a)11+11+11+11+11+11+11+11+11=\(11^9\)=99.

b)56+56+12+12+12+20+56+56+56=56+56+56+56+56+56=\(56^6\)=336.

c)\(45^8\)=360.

d)\(12^4\)=48

a)11+11+11+11+11+11+11+11+11=\(11^9\)=99.

b)56+56+12+12+12+20+56+56+56=56+56+56+56+56+56=\(56^6\)=336.

c)\(45^8\)=360.

d)\(12^4\)=48

a)11+11+11+11+11+11+11+11+11=\(11^9\)=99.

b)56+56+12+12+12+20+56+56+56=56+56+56+56+56+56=\(56^6\)=336.

c)\(45^8\)=360.

d)\(12^4\)=48

A 12x56 + 12x44 =44+56=100

100X56=5600

b 45x12-45x2+45x90=90+2-12=80

80x45=3600

a) 12 x 56 + 12 x 44

=12.(56+44)

=12.100

=1200

b) 45 x 12 - 45 x 2 + 45 x 90

=45.(12-2+90)

=45.100

=4500

a)12x56+12x44

=12(56+44)

=12x100

=1200

b)45x12-45x2+45x90

=45(12-2+90)

=45x100

=4500

x=-538

a)  1 2 + − 2 3 + 1 6 + 3 7 = 3 6 + − 4 6 + 1 6 + 3 7 = 3 7

b)  1 2 + 2 8 + 3 4 + 4 5 + 5 6 = 30 60 + 40 60 + 45 60 + 48 60 + 50 60 = 71 5