\(=27\left(43+93\cdot2\right)-43\cdot81\)
\(=27\cdot229-43\cdot81\)
=2700
\(=27\left(43+93\cdot2\right)-43\cdot81\)
\(=27\cdot229-43\cdot81\)
=2700
2x + x - 12 = 0
64 . 6 + 81 . 4 + 17 . 6
43 . 27 + 93 . 43 + 57 . 61 + 59 . 57
tính nhanh:
a. 119 + 24 + 81
b. 16 . 6 .125
c. 25 . 104
d. 12 . 19 + 12
e. 43 . 27 + 93 . 43 + 57 . 61 + 59 . 57
2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40 = ???
12 . 25 + 29 . 25 + 59 . 25 = ???
43 . 37 + 93 . 43 + 57 . 61 + 69 . 57 = ???
12 . 53 + 53 . 172 - 53 = ???
35 . 54 + 35 . 58 + 65 . 75 + 65 . 45 = ???
39 . 8 + 70 . 3 + 31 . 8 = ???
1) Tính nhanh :
a) 8 x 17 x 125
c) 4 x 37 x 25
d) 43 x 27 + 93 x 43 + 57 x 81 + 69 x 57
e) 123456789 x 45 biết 12345679 x 9 = 111 111 111
Bài 2 Tính nhanh:
(1)1. 1 + (-1)2.2 + (-1)3.3 + .... + (-1)2020.2020
1572 – (17 – 3726) – (3726 + 1584)
149 – (127 – 51) + 35 – (73 + 235)
(-27).18 – 12.(-54)
(-43). (55 – 81) + 55.(43 – 81)
C = – (93 – 127 + 54) + (– 4 + 227 + 43)
Bỏ ngoặc rồi tính nhanh
Thực hiện các phép tính sau :
1, 37 - 58 + 75 - 58
2, 49 - 54 + 41 - 52 + 59
3, 43 - 27 - 43 - 38 + 27
4, 18 - 43 - ( 18 - 43 ) - 51
5, ( 37 - 54 - 43 ) - ( 37 - 54 + 42 )
6, - ( 39 - 42 + 38 ) - ( 42 - 39 +38 ) + 95
\(\left(\frac{2}{199}-\frac{3}{398}\right):\frac{17}{199}+\frac{3}{17}\)
\(\left(\frac{-1}{6}+\frac{5}{-12}\right)+\frac{7}{12}\)
\(0.6\times\frac{8}{5}\times30\times0.675\times1\frac{2}{9}\)
\(\frac{43}{27}\left(\frac{27}{43}+\frac{86}{54}\right)-\frac{86}{54}\left(\frac{43}{27}-\frac{27}{43}\right)\)
Tính
A. -21 + 57 - (-195) + 43 - 93
B. -25 . 19 - 19 . (-125) + (-310)
C. 64 . 47 . 32 . 106 - (-54)
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