a)3254+146+1698=5098

4367+199+501=5067

4400+2148+252=6800

b)921+898+2079=3898

1255+436+145=1836

467+999+9533=10999

a/3254+146+1698=5098   

4367+199+501=5067

4400+2148+252=6800

b/921+898+2079=3898

1255+436+145=1836

467+999+9533=10999

a)3254+146+1698=5098

4367+199+501=5067

4400+2148+252=6800

b)921+898+2079=3898

1255+436+145=1836

467+999+9533=10999

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

\(C=-\left(279\times6+292\right)+6\times279-\left(9-292\right)=6\times279+292-9-6\times279-292=-9\)

\(=\left(-146+146\right)+\left(-5\right)+\left(-15\right)\)
\(=0+\left(-5\right)+\left(-15\right)\)
\(=-20\)

\(2021-\left(146+2021\right)+\left(-46+146\right)\\ =2021-146-2021-46+146\\ =-46\)

-46 nha

Chúc bạn hok tốt

29^2 - 58 . 19 + 19^2

= 841 - 1102 + 361

= 100

\(29^2-58.19+19^2\)

\(=841-1102+361\)

\(=-261+361\)

\(=100\)