nhanh lên mình xin đấy

a) \(2900\times94+2900\times5+2900\)
\(=2900\times\left(94+5+1\right)\)
\(=2900\times100\)
\(=290000\)
b) \(34000:125:8\)
\(=34000:\left(125\times8\right)\)
\(=34000:1000\)
\(=34\)

65 + 65 x 19 + 65 x 65 + 65 x 15

= 65 x 1 + 65 x 19 + 65 x 65 + 65 x 15

= 65 x (1 + 19 + 65 + 15)

= 65 x 100

= 6500

\(842\times65+842\times36-842\)

=\(842\times\left(65-36-1\right)\)

=\(842\times100\)

=\(84200\)

= 842 . 65 + 842 . 36 - 842 .1

= 842 .( 65 + 36 - 1)

=842 . 100

= 84200

930 x 65 + 65 x 70

= 65 x (930 + 70)

= 65 x 1000

= 65 000

930 x 65 + 65 x 70 = (930 + 70) x 65

= 65000

154 x 35 + 154 x 65 = 154 x (35 + 65)  

= 154 x 100  = 15400

456 x 65 + 456 x 25 + 456 x 10

=456x(65+25+10)

=456x100

=45 600

a , 25 + 35 + 76 +65 + 22
= 25+(35+65)+(76+22)
=25+100+100
=225

b , 24 + 25  + 24 x 22
=24(1+22)+25
=552+25
=577

c , 78 - 23 - 25
=78-(23+25)
=78-48
=30

bài b sai pk cj ạ tự dưng 76 + 22 lại bằng 100 ??

a) 81 + 35 + 19 = (81 + 19) + 35

= 100 + 35

= 135

b) 78 + 65 + 135 + 22 = (78 + 22) + (65 + 135)

= 100 + 200

= 300

a) 81+35+19

=80+30+(1+9)+5

=110+10+5

=120+5

=125

b) 78+65+135+22

=70+60+130+20+(8+2)+(5+5)

=280+10+10

=300

25 . 35 + 24 . 65

= 875 + 1560

= 2435

b: \(24\cdot35+24\cdot65\)

=24x100

=2400

a: Ta có: 24+35+76+65+22

=(24+76)+(35+65)+22

=222

b: Sửa đề: \(24\cdot35+24\cdot65\)

=24x100

=2400