53.47 = 2491

Kết bạn nhé

\(53\cdot47=2491\)

GIÚP MIK IK PLZZ :(

=\(53\left(47+53\right)-1=5299\)

BÀi 1:

a: (-243+345)-(257+(-55)-129)

=-243+345-257+55+129

=(-243-257)+(345+55)+129

=-500+400+129

=-100+129

=29

b: \(\left(-2\right)^3-45:\left(-3\right)^2-\left(-2019\right)^0\cdot\left(-1\right)^{2019}\)

\(=-8-\frac{45}{9}-1\cdot\left(-1\right)\)

=-8-5+1

=-13+1

=-12

c: \(\left\lbrack27\cdot\left(-67\right)+33\cdot\left(-27\right)\right\rbrack:\left(-30\right)\)

\(=\frac{-27\left(67+33\right)}{-30}\)

\(=\frac{9}{10}\cdot100=90\)

d: \(\left(1^2+2^2+\cdots+100^2\right)\left(3^4-9^2\right)\)

\(=\left(1^2+2^2+\cdots+100^2\right)\left(81-81\right)\)

=0

e: \(53\cdot47+53^2-2021^0\)

\(=53\left(53+47\right)-1\)

=5300-1

=5299

i: 38+(-21)+(-58)+(-6)

=(38-58)+(-21-6)

=-20-27

=-47

h: (2020+27)-[2020+(-73)]-129

=2020+27-2020+73-129

=100-129

=-29

=378 x (24 + 27 + 49)
=378 x          100
= 37800

=378x(24+27+49)

=378x100

=37800

cho mình ít coin

1-19/37=18/37

19/37+18/37=37/37=1

\( 19/37+(1-19/37) =19/37+1-19/37 =1\)
 

kết quả =4

= 2 + 2 + 2 + 2 + 1 + 1 + 1 + 1 - 2 -2 -2 -2 = 4  nha = ))

\(\frac{21}{11}x\frac{22}{17}x\frac{51}{35}=\frac{3x7x2x11x3x17}{11x17x5x7}\)

Bạn gạch hết những số giống nhau ở cả mẫu số và tử số thì bạn sẽ được kết quả như sau:

\(\frac{3x2x3}{5}=\frac{18}{5}\)

Bạn ghép 2 cái ở trên lại với nhau sẽ ra được nguyên bài

18/7 nho k nhe

hhgggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg

\(\left(24\%+\dfrac{3}{4}+0,76+25\%\right)\times\left(\dfrac{3}{\dfrac{5}{7}}+\dfrac{1}{\dfrac{8}{28}}\right)\)

\(=\left(0,24 +0,75+0,76+0,25\right)\times\left(4,2+10,5\right)\)

\(=\left[\left(0,24+0,76\right)+\left(0,75+0,25\right)\right]\times\left(4,2+10,5\right)\)

\(=\left[1+1\right]\times\left(4,2+10,5\right)\)

\(=2\times14,7=29,4\)

\(~HT~,#Ng\)