(4367+3633)-(501+199)=8000-700=7300 dốt vừa thôi em nhé!

Thằng Kiệt mất dạy!

a) 3254 + 146 + 1698 = 3400 + 1698

= 3400 + 1600 + 98

= 5000 + 98

= 5098

4367 + 199+501 = 4367 + 700

= 4300 + 700 + 67 = 5000 + 67 = 5067

4400 + 2148 + 252

= 4400 + 2400 = 6800

b) 921 + 898 + 2079

= 921 + 2079 + 898

= 3000 + 898 = 3989

1255 + 436 + 145

= 1400 + 436 = 1836

467 + 999 + 9533

= 10000 + 999 = 10999

tra loi nhanh !

1.

a) 3254 + 146 + 1698 = 3400 + 1698 = 5098            

    4367 + 199 + 501 =4367 + (199 + 501) = 4367 + 700 = 5067                       

    4400 + 2148 + 252 = 4400 + (2148 + 252) = 4400 + 2400 = 6600                  

b) 921 + 898 + 2079 = (921 + 2079) + 898 = 3000 + 898 = 3989

    1255 + 436 + 145 =(1255 + 145) + 436 =1400 + 436 = 1836

     467 +  999 + 9533 = (467 + 9533) + 999 = 10000 + 999 = 10999

ghe vay toan lop 4 day

a. 3254 + 146 + 1698

= ( 3254 + 146 ) + 1698

=  3400 + 1698

= 5098.

b. 4367 + 199 + 501 

=  ( 199 + 501 ) + 4367

=  700 + 4367

= 5067.

c. 4400 + 2148 + 252

= ( 2148 + 252 ) + 4400

= 2400 + 4400

= 6800.

1268 + 99 + 501= 1268 + ( 99 + 501)

…= 1268 + 600 = 1868

a) 1268 + 99 + 501= 1268 + ( 99 + 501)

…= 1268 + 600 = 1868

745 + 268 + 732= 745 + ( 268 + 732 )

= 745 + 1000 = 1745

1295 +105 + 1460= 1400 + 1460

= 2860

Ngu hết

=199x3+199x7

=199x(3+7)

=199x10

=1990

hok tốt

= 199 x ( 3 + 7 )

= 199 x 10

= 1990

 199 + 199 + 199 + 199 x 7

=  199 x 1 + 199 x 1 + 199 x 1 + 199 x 7

= 199 x ( 1 + 1 + 1 + 7 )

= 199 x 10

= 1990

 Hok tốt

a) 325 x 145 + 145 x 475 + 145 + 145 x 199 = 145 x (325+475 + 1 +199)

= 145 x 1000 = 145000

2003x2005+200=4016215

2004x2004+199=4016215

= 4016215

=4016215