23458 * 1256 = 29463248

29363248 nhé

Kết bạn đi

bằng 1 nha

1

9 x 5 = 45

63 : 7 = 9

8 x 8 = 64

5 x 7 = 35

8 x 7 =56

3 x 8 = 24

40 : 5 = 8

5 x 5 = 25

7 x 5 = 35

7 x 8 =56

6 x 4 = 24

45 : 9 = 5

7 x 7 = 49

35 : 5 = 7

56 : 8 = 7

2 x 8 = 16

81 : 9 = 9

9 x 9 = 81

35 : 7 = 5

56 : 7 = 8

 \(\dfrac{92}{9}+\dfrac{13}{5}-\dfrac{56}{9}\)

=( \(\dfrac{92}{9}-\dfrac{56}{9})+\dfrac{13}{5}\)

=       \(\dfrac{36}{9}\)+ \(\dfrac{13}{5}\)

= 4 + \(\dfrac{13}{5}\)

= \(\dfrac{20}{5}\) + \(\dfrac{13}{5}\)

= \(\dfrac{33}{5}\)

\(\frac{4}{9}+\frac{5}{9}+...+\frac{56}{9}=\frac{4+5+..+56}{9}\)

ta có 4 + 5 + ...+ 56 có (56-4):1+1 = 53 số hạng và (53-1):2=26 cặp

ta thành lập cặp 

4 + 55 = 59

5 + 54 = 59

tương tự ..........................

.........................................

vậy 4 + 5 + ...+ 56 = 59 x 26 + 53 = 1587

vậy\(\frac{4}{9}+\frac{5}{9}+...+\frac{56}{9}=\frac{4+5+..+56}{9}=\frac{1587}{9}=\frac{529}{3}\)

11281 bạn nhé

11281 nha ban

\(56+7.\left(-5\right)+\left(-9\right).\left(-2\right)\)

\(=56+\left(-35\right)+18\)

\(=39\)

56 + 7.(-5) +(-9).(-2)

= 56 - 35+18

= 39

1. 

$(5^{1986}-5^{1985}):5^{1985}=5^{1985}(5-1):5^{1985}=5-1=4$

2.

\((7^{846}+7^{847}):7^{846}=7^{846}(1+7):7^{846}=1+7=8\)

3.

\((9^{2018}-3^{4036}):6^{2006}=[(3^2)^{2018}-3^{4036}]:6^{2006}\)

$=(3^{4036}-3^{4036}):6^{2006}=0:6^{2006}=0$

4.

$(7^{80}.8^{70}-56^{70}):56^{70}$

$=[7^{10}(7.8)^{70}-56^{70}]:56^{70}$

$=[7^{10}.56^{70}-56^{70}]:56^{70}$

$=56^{70}(7^{10}-1):56^{70}=7^{10}-1$

5.

$4^{4016}:(4^{4017}-4^{4016})=4^{4016}:[4^{4016}(4-1)]$

$=4^{4016}:4^{4016}:3=1:3=\frac{1}{3}$

6.

$(12^{206}.2^{207}-24^{206}):24^{206}$

$=(12^{206}.2^{206}.2-24^{206}):24^{206}$

$=[(12.2)^{206}.2-24^{206}]:24^{206}$

$=(24^{206}.2-24^{206}):24^{206}$

$=24^{206}(2-1):24^{206}=2-1=1$

7.

$(5^2-24)^{8946}+4^{30}:2^{60}=1^{8946}+(2^2)^{30}:2^{60}$

$=1+2^{60}:2^{60}=1+1=2$

8.

$(37.8^{1007}-7.2^{3021}):8^{1007}=[37.8^{1007}-7.(2^3)^{1007}]:8^{1007}$

$=[37.8^{1007}-7.8^{1007}]:8^{1007}$

$=8^{1007}(37-7):8^{1007}=37-7=30$

a) (-45) : 5 = -9

b) 56 : (-7) = -8

c) (-207) : (-9) = 23

a) (-45):5=-9

b) 56:(-7)=-8

c) (-207):(-9)=23

Đề bài yêu cầu gì?

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