5: \(=42\cdot\left(15+96+25+4\right)=42\cdot140=5880\)
6: \(=45\left(13+78+87+22\right)=45\cdot200=9000\)
5: \(=42\cdot\left(15+96+25+4\right)=42\cdot140=5880\)
6: \(=45\left(13+78+87+22\right)=45\cdot200=9000\)
1. Tính
a, 1+7+8+15+23+...+160
b, 17+4+5+9+19+...+60+9
c, 78*3+78*24+78*17*22*72
d, 53*39+47*39+47-53*21-47*21
e, 2*53*12+4*6*87-3*8*40
g, 5*7*77-7*60+49*25-15*42
h, 1*2+2*3+3*4+...+2016*2017
BT1: Tính nhanh:
1) 45 . ( 13 + 78 ) + 9 . ( 87 + 22 ) .5
2) 43 . 37 + 93 . 43 + 57 . 61 + 69 . 57
Tính nhanh :
1 + 7 + 8 + 15 + 23 + ... + 160
1 + 4 + 5 + 9 + 14 + ... + 60 + 97
78 x 31 + 78 x 24 + 78 x 17 + 72 x 22
A = 1 x 4 + 2 x 5 + 3 x 6 + 4 x 7 + .... n x ( n+ 3 )
Giúp mình nha,ai làm chi tiết và đúng mình tích 15 cái
Bài 1: Tìm x , biết:
1) x - 2 = -6 12) 3 . | x - 1 | - 5 = 7
2) -5 . x - ( -3 ) = 13 13) -12 . ( x - 5 ) + 7 . ( 3 - x ) = 5
3) 15 - ( x - 7 ) = -21 14) ( x - 2 ) . ( x + 4 ) = 0
4) 3 .x + 17 = 2 15) ( x - 2 ) . ( x + 15 ) = 0
5) 45 - ( x - 9 ) = -35 16) ( 7 - x ) . ( x + 19 ) = 0
6) ( -5 ) + x = 15 17) -5 < x < 1
7) 2 . x - ( -17 ) = 15 18) | x | < 3
8) | x - 2 | = 3 19) ( x - 3 ) . ( x - 5 ) < 0
9) | x - 3 | - 7 = 13 20) 2 . x2 - 3 = 29
10) 72 - 3 . | x + 1 | = 9 21) -6 . x - ( -7) = 25
11) 17 - ( 43 - | x | ) = 45 22) 46 =- ( x - 11 ) = -48
Tính
1) (- 2) . (- 7) . (- 5) 2) 15 – 22 + ( - 17)
3) 25. (- 4) – 20. (- 5) 4) 185 – (49 + 185)
5) ( -19 ) . (- 13) + 13 . (-29)
6)79 . 23 + 21 . 23 7) 2. ( 6 . 42 – 85 : 5)
8) (-5) .8 . (-2) . 3 9) 200 +32 –( 50 +32 )
10) 3 . (-2)2 + 4 . (-5) +20
bài 1 : tinh gtri biểu thức
c, 78 + 22 x (96 : 3+ 20 )
d,( 779 : 41 x 16) x ( 435 - 249)
bài 2 : tính nhanh
a, 137 x 6 + 63 x 6 + 200 x 4
b. 42 x 43 + 43 x 57 + 43
c, 754 x 75 - 2262 x 25 + 4568
Câu 1:
a) -8 + 5
b) -6 - 10
c) (-50) . (-9)
d) (-45) : 9
e) 24 . 125 + 24 . 75
g) 42 - 7 . 25
h) (5-7) . 11
i) (-3 - 12) : (-5)
k) 3 . (-4)^2 + 2 . (-5)
l) 125 . (-15) . 8
1 . Tính nhanh
a/ 15 . ( 27 + 18 + 6 ) + 15 . ( 23 + 12 )
b/ 14 . 35 . 5 + 10 . 25 .7 + 20 . 70
c/ 53 . ( 51 + 4 ) + 53 . ( 49 + 96 ) + 53
d/ 46 . ( 27 + 75 ) + 8 . ( 58 + 25 ) . 2
Rút gọn
1.\(\left(\frac{2}{45}-\frac{4}{13}-\frac{1}{3}\right):\left(\frac{3}{13}-\frac{4}{15}+\frac{2}{13}\right)\)
2.\(\frac{0,8:\left(\frac{4}{5}.1,25\right)}{0,64-\frac{1}{25}}+\frac{\left(1,08-\frac{2}{15}\right):\frac{4}{7}}{\left(6\frac{5}{9}-3\frac{1}{4}\right)2\frac{2}{17}}\)
3.\(\frac{0,4-\frac{2}{9}+\frac{2}{11}}{1,4-\frac{7}{9}+\frac{7}{11}}-\frac{\frac{1}{3}-0,25+\frac{1}{5}}{1\frac{1}{6}-0,875+0,7}\)