123-76=47

56-51=5

78-56=22

56-7x5=21

53-23=30

42:2=21

chúc bạn học giỏi hơn

tk mình nha

123-76=47     :      56-51=5         : 78-56=22    

56-(7x5)

56-35=21       :      53-23=30       :  42 :2=21

\(123-76=47\)

\(56-51=5\)

\(78-56=22\)

\(56-7\times5=21\)

\(53-23=30\)

\(42:2=41\)

a) -79 - 79.99 = -79(1 + 99) = -79.100 = -7900

b) -123.47 + 47.23 = -47(123 - 23) = -47.100 = -4700

c) 19 - 42.(-19) + 38.5 = 19 + 42.19 + 38.5 = 19(1 + 42 + 10) = 19.53 = 20.53 - 53 = 1060 - 53 = 1007

minh cung dang thac mac cau nay ban nao giup minh voi

kho qua cac ban oi

a) 2763 + 152=2915
b) (-7) + (-14)=-21
c) (-35) + 35=0
d) (-5) + (-248)=-253
e) (-23) + 105=82
f) 78 + (-123)=-45
g) 23 + (-13)=10
h) (-23) + 13=-10
i) 26 + (-6)=20

j) 12 – 34=-22
k) -23 – 47=-70
l) 31 – (-23)=54
m) -9 – (-5)=-4
n) 6 – (8 – 17)=15
o) 19 + (23 – 33)=9
p) (-12 – 44) + (-3)=-59
q) 4 – (-15) –(-25)=44
r) -7 -14 – 26 –(-28)=-19

Bài gì mà lộn xộn vậy trời . Không hiểu gì luôn .

a: \(-81\cdot36+\left(-81\right)\cdot63-81\)

\(=36\cdot\left(-81\right)+63\cdot\left(-81\right)+\left(-81\right)\)

\(=-81\left(36+63+1\right)\)

\(=-81\cdot100=-8100\)

b: \(23\cdot\left(-38+123\right)-123\cdot\left(23-38\right)\)

\(=-23\cdot38+23\cdot123-123\cdot23+123\cdot38\)

\(=123\cdot38-23\cdot38=38\left(123-23\right)=38\cdot100=3800\)

g: =>3x-10=200

hay x=70

c) (7x + x – 28) :100 – 38 = 9

<=> 8x - 28 = 4700

<=> x = 591

d) 936 – (4x + 5x ) = 900

<=> 9x = 36

<=> x = 4

b,19/4 + 37/100 + 1/8 + 132/25 + 5/2 + 37/12=37/15