a) \(45^2+33^2-22^2+90.33\)

\(=\)\(\left(45^2+33^2+2.45.33\right)-22^2\)

\(=\left(45+33\right)^2-22^2\)

\(=\left(45+33+22\right)\left(45+33-22\right)\)

\(=100.56\)

\(=5600\)

a) \(=3\left(5y+4x\right)\)

b) \(=\left(x-3\right)^2\)

c) \(=y\left(y^2+2y+3\right)\)

d) \(=x\left(x+y\right)+6\left(x+y\right)=\left(x+6\right)\left(x+y\right)\)

Lời giải:

a. $=128-78+100-128=(128-128)+100-78=0+100-78=22$

b. $=125-100+93-218= (125+93-218)-100=0-100=-100$

c. $=453+74-79-527$

$=(453+74-527)-79 =0-79=-79$
d.

$=-825+775+825=(825-825)+775=0+775=775$

e.

$=163-413-187+637 = (163+637)-(413+187) = 800-600=200$

\(a,=\left(93-7\right)\left(93+7\right)=100\cdot86=8600\\ b,=\left(45+55\right)^2=100^2=10000\)

dễ 452*23=10396   234*78=18252       610/456=1.337719298.....

tick nhé          tạ thùy trang

10396

18252

1,33

10396

18252

1,337719298

Câu 1: x = 50

Câu 2: ko bik

386 + 793 = 1179

234 + 673 = 907

573 + 456 = 1029

452 + 352 = 804

-.-

k mik

Bài 1:
\(130050:452=287\)(dư 326)
\(19183:78=245\)(dư 73)
\(204\times1942=396168\)
Bài 2:
\(\dfrac{4}{9}+\dfrac{3}{7}=\dfrac{28}{63}+\dfrac{27}{63}=\dfrac{55}{63}\)
\(\dfrac{7}{15}-\dfrac{11}{30}=\dfrac{14}{30}-\dfrac{11}{30}=\dfrac{3}{30}=\dfrac{1}{10}\)

1.9056

2.129006

3.584146200000

4.19007388

1, 452 x 64 - 552 x 36

=28928-19872=9056

2, 324 x 598 - 327 x 198

=193752-64746=129006

3, 8350 x 640 x 360 x 350

=5344000 x 360 x 350=1923840000 x 350=584146200000

4, 704 x 135 x 200 - 153 x 4

=19008000-153 x 4 = 19007388

1, 452 x 64 - 552 x 36

=28928-19872=9056

2, 324 x 598 - 327 x 198

=193752-64746=129006

3, 8350 x 640 x 360 x 350

=5344000 x 360 x 350=1923840000 x 350=584146200000

4, 704 x 135 x 200 - 153 x 4

=19008000-153 x 4

= 19007388

=  225.55 +  225.55

=  451.1 

a)\(65.3,47+3,47.65\)
\(=65.\left(3,47+3,47\right)\)
\(=65.6,94\)
\(=451,1\)

\(65\times\left(3,47+3,47\right)=65\times6,94=451,1\)