a) 13276-(4500+3276)= 13276-4500-3276

                                    = 13276-3276-4500

                                    = 10000-4500=5500

b) 58264+4723-8264-723=58264-8264+4723-723=50000+4000=54000

a) 13726-(4500+3726)=13726-4500-3726=13726-3726-4500=10000-4500=5500

a,, 13 726 - ( 4500 + 3726 )

   = 13 726 - 4500 - 3726 

= (13 726 - 3726 ) - 4500

= 10 000 - 4500

= 5500 

b, 58264 + 4723 - 8264 - 723 

= ( 58264 - 8264 ) + (4723 - 723 )

= 50 00 + 4000

= 54 000

8264 + 927 < 927 + 8300

8264 + 927 > 900 + 8264

927 + 8264 = 8264 + 927

a) 2975 + 4017 = 4017 + 2975

2975 + 4017 < 4017 + 3000

2975 + 4017 > 4017 + 2900

b) 8264 + 927 < 927 + 8300

8264 + 927 > 900 + 8264

927 + 8264 = 8264 + 927

  (637.527-189):(526.637+448)

= \(\frac{637.527-189}{526.637+448}\)

= \(\frac{637.\left(526+1\right)-189}{526.637+448}\)

=  \(\frac{637.526+637-189}{526.637+448}\)

= \(\frac{637.526+448}{526.637+448}\)

= \(1\)

B = 43 x 102

B = 43 x (100 + 2)

B = 43 x 2 + 43 x 100

B = 86 + 4300

B = 4386

B=43x102

=43x100+43x2

=4300+68

=4386(cách nhanh nhất có thể)

\(B=43\times102\)

\(B=4386\)

327 - 16 + 216 - 27 + 500

= ( 327 - 27) + ( 216-16) + 500

= 300 + 200 + 500

= 1000

`= ( 327 - 27) + ( 216-16) + 500`

`= 300 + 200 + 500`

`= 1000`

327 - 16 + 216 - 27 + 500

\(=\left(327-27\right)+\left(216-16\right)+500=300+200+500=1000\)

Đáp án D