\(\left(100+58\right)\times58+\left(200-42\right)\times12\)

\(=158\times58+158\times12\)

\(=158\times\left(58+12\right)\)

\(=158\times70=11060\)

\(128\times72+14\times256\)

\(=128\times72+14\times2\times128\)

\(=128\times\left(72+28\right)\)

\(=128\times100=12800\)

\(157\times99+123+34\)

\(=157\times99+157\times1\)

\(=157\times\left(99+1\right)\)

\(=157\times100=15700\)

\(67+98\times45+23\)

\(=98\times45+90\)

\(=98\times45+45\times2\)

\(=45\times\left(98+2\right)\)

\(=45\times100=4500\)

Đặt tính rồi tính:

a)15 : 8 = 1.875

b) 60 : 12,5 = 4.8

c) 123 : 6,7 = 18.3582089552

d)125 : 35,1 = 3.56125356125

e) 3467 : 12,6 = 275.158730159

g) 678 : 12,8 = 52.96875

 =123 x ( 345 + 354 + 567 + 576 +1 )

=123 x 1843

= 226689

k nha

123 x 345 + 123 x 354 + 123 x 567 + 123 x 576 + 123

=123x(345+354+567+576+1)

=123x1843

=226689

=224475

= 0

= 246

k mình nha!

trả lời

345-345=0

123+123=246

hok tốt

345-345=0

123+123=246

học tốt

=345*(123-23)=345*100=34500

345x123-345x23

=345x(123-23)

=345x100

=34500

345 x 123 - 345 x 23

= 345 x ( 123 - 23 )

= 345 x 100

= 34500

x + 123 = 234 + 345

x + 123 = 579

x = 579  - 123

x = 456

x + 123 = 234 +345

x + 123 = 579

x = 579 - 123

x = 456

x + 123 = 234 + 345

x + 123 = 579

x = 579 - 123 

 x = 456

a) x – 123 = 345                                                         b) x + 254 = 665

         x      = 345 + 123                                                    x          = 665 – 254

         x      =  468                                                                x       = 211

123 x 45 - 345 + 1234

= 5535 - 345    +1234

=    5190          + 1234

=         6424

\(123\times45-345+1234\)

\(=492-345+1234\)

\(=147+1234\)

\(=1381\)

123 x 45  - 345 + 1234

=5535 -345 + 1234

=5190 + 1234

=6424

hok tốt .