\(\frac{464}{466}x\frac{43556}{58343}=\frac{464x43556}{466x58343}=\frac{20209984}{27187838}=0,743346491\)

34.{[(216+184):8]-42}

=34.{[400:8]-42}

=34.{50-42}

=34.8

=272

465+58+(-465)+(-78)

=523+(-465)+(-78)

=58+(-78)

=-20

1+(-3)+5+(-7)+9+(-11)

=[1+(-3)]+[5+(-7)]+[9+(-11)]

=-2.3

=-6

1+2+3.......+100

=101x50

=5050

80-[30-(5-1)2]

=80-[30-4.2]

=80-[30-8]

=80-22

=58

34.{[(216+184):8]-42}

= 34.[(400:8)-42]

= 34.(50-42)

= 34.8

= 272

465+58+(-465)+(-78)

= (465-465)+(58-78)

= 0+(-20)

= -20

1+(-3)+5+(-7)+9+(-11)

= (1+5+9)-(3+7+11)

= 15-21

= -6

1+2+3+...+100=\(\frac{\left(100+1\right).100}{2}\)=5050

80-[30-(5-1).2]

= 80-(30-4.2)

= 80-(30-8)

= 80-30+8

= 50+8

= 58

= ( 465 x 9 ) +5

= 4185 + 5 

= 4190

Đ/S : 4190

=4189.5/9=465(du5)

Ta lấy : 465x9+5=4190

30.75+87.465=118.215

b=465062.1

c = 2476.458

d=19.84628712871287

465+58+(-465)+(-78)=-20

1+(-3)+5+(-7)+9+(-11)=-6

465+58+(-465)+(-78)=(-78)-(-58)=-20

1+(-3)+5+(-7)+9(-11)=-2+-2+-2=-6

1+2+3+...+100=(100+1)*(100-1)+1:2=101*100:2

101*50=5050

**** mk nha Thanh Trúc thông minh

câu hỏi là j vậy bn

a) 8 359 + 305 x 38

= 8359 + 11590

= 19949

b) 4 824 - (9 365 - 5 465) : 15

= 4824 - 3900 : 15

= 4824 - 260

= 4564

a) 8 359 + 305 x 38 = 8 359 + 11 590

                              = 19 949                   

b) 4 824 – (9 365 – 5 465) : 15 = 4 824 – 3 900 : 15

                                               = 4 824 – 260

                                               = 4 564

a,13

b,16276

c,20

d,20

a) (-17)+5+8+17

=(-17+17)+(5+8)

=0+13

=13

b) (-4)+(-440)6(-6)+440

đề thiếu

c) 465+[58+(-465)+(-38)]

=465+58+(-465)+(-38)

=(-465+465)+(-38+58)

=0+20

=20

d) 465+[58+(-465)+(-38)]

giống bài c