a) 36 x 532 + 63 x 532 + 532

= 532 x (36 + 63 + 1)

= 532 x 100

= 53200

b) 679 + 679 x 123 - 679 x 24

= 679 x (1 + 123 - 124)

= 679 x 0

= 0

c) 245 x 327 - 245 x 18 - 9 x 245

= 245 x (327 - 18 - 9)

= 245 x 300

= 73500

a)

\(36\times532+63\times532+532\)

\(=36\times532+63\times532+532\times1\)

\(=532\times\left(36+63+1\right)\)

\(=532\times100\)

\(=53200\)

b)

\(679+679\times123-679\times24\)

\(=679\times1+679\times123-679\times24\)

\(=679\times\left(1+123-24\right)\)

\(=679\times100\)

\(=67900\)

c)

\(245\times327-245\times18-9\times245\)

\(=245\times\left(327-18-9\right)\)

\(=245\times300\)

\(=73500\)

a)

   36 x 532 + 63 x 532 + 532

= 36 x 532 + 63 x 532 + 532 x 1

= ( 36 + 63 + 1 ) x 532

=              100 x 532

=                 53200

b)

   679 + 679 x 123 - 679 x 24

= 679 x 1 + 679 x 123 - 679 x 24

= 679 x ( 1 + 123 - 24 )

=  679 x 100

=    67900

c)

  245 x 327 - 245 x 18 - 9 x 245 

= 245 x ( 327 - 18 - 9 )

=  245 x 300

=        73500 

679+679x123-679x24

=679x1+679x123+679x24

=679x(1+123-24)

=679x100

=67900

245x327-245x18-9x245

=245x(327-18-9)

=245x300

=73500

679 +679 x 123 - 679 x 24

= 679 x ( 1 + 123 - 24 ) 

= 679 x 100

= 67900

245 x 327 - 245 x 18 - 9 x 245

= 245 x ( 327 - 18 - 9 ) 

= 245 x 300

= 73500

679+679x123-679x24

=679x1+679x123-679x24

=679x(1+123-24)

=679x100

=67900

245x327-245x18-9x245

=245x(327-18-9)

=245x300

=73500

679+679×123-679×24

=679x(1+123-24)

=679x100

=67900

245×327-245×26-245

=245x(327-26-1)

=300x245

=73500

2005×1999-1000×2005+2005

=2005x(1999-1000+1)

=2005x1000

=2005000

679 + 679 x 123 - 679 x 24

= 679 x 1 + 679 x 123 - 679 x 24

= 679 x ( 1 + 123 - 24 )

= 679 x 100

= 67900

Đ/S 67900

245 x 327 - 245 x 26 - 245

= 245 x 327 - 245 x 26 - 245 x 1

= 245 x ( 327 - 26 - 1)

= 245 x 300

=73500

Đ/S 73500

2005 x 1999 - 1000 x 2005 + 2005

= 2005 x 1999 - 1000 x 2005 + 2005 x 1

= 2005 x ( 1999 - 1000 + 1)

= 2005 x 1000

= 2005000

Đ/S 2005000

679+679*123-679*24

=679+679*(123-24)

=679+679*99

=679+67221

=67900

\(36\cdot532+64\cdot532=532\cdot100=53200\)

36 x 532 + 64 x 532

=(36+64)x532

= 100x532

=53 200

245 x 327 - 245 x 26 - 245

=245x327-245x26-245x1

=245x(327-26-1)

=245x300

=73 500

3. Tính bằng cách thuận tiện nhất

A, 36 x 532 + 63 x 532 + 532

= (36 + 63 + 1) x 532 = 100 x 532 = 53 200

B, 679 x 123 + 679 - 679 x 24

= 679 x (123 + 1 - 24)

= 679 x 100 = 67 900

C, 245 x 327 - 245 x 18 - 9 x 245

= 245 x (327 - 18 - 9)

= 245 x 300

= 73 500

Bài 2:

a: \(6\cdot\left(x+9845\right)=29042\)

=>\(x+9845=\dfrac{29042}{6}=\dfrac{14521}{3}\)

=>\(x=\dfrac{14521}{3}-9845=-\dfrac{15014}{3}\)

b: \(\left(x:3\right)\cdot8=8\cdot3198\)

=>\(x:3=3198\)

=>\(x=3198\cdot3=9594\)

Bài 1:

a: \(225886+779\cdot8\)

\(=225886+6232\)

\(=232118\)

b: \(125\cdot5\cdot20\cdot8\)

\(=\left(125\cdot8\right)\cdot\left(5\cdot20\right)\)

\(=1000\cdot100=100000\)

c: \(47286:2+14765\)

\(=23643+14765\)

=38408

d: \(91428-23560:5\)

\(=91428-4712\)

=86716

\(a,564\times8-64\times4\times2=564\times8-64\times8=8\times\left(564-64\right)=8\times500=4000\\ b,37\times18-9\times74+100\\ =37\times2\times9-9\times74+100\\ =\left(74\times9-9\times74\right)+100=0+100=100\\ c,679\times78+679\times23-679=679\times\left(78+23-1\right)\\ =679\times100\\ =67900\)

[1 x 2 x 3 x 4 x........................x100] x [679+679 x 123-679 x124]

  =            A                            x          [679 x 124-679 x 124]

  =            A                           x                  0

  =0         

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