=23(17+83)+47(71+29)

= 23.100+47.100

=100.(23+47)

=100.70=7000

23.17+47.71+83.23+47.92

=23.(17+83)+47.(29+71)

=23.100+47.100

=2300+4700

=7000

53 x 29 + 47 x 29 - 53 x 21 - 47 x 21

= 29 x ( 53 + 47 ) - 21 x ( 53 + 47 )

= 29 x 100 - 21 x 100

= 100 x ( 29 - 21 )

= 100 x 8

= 800 

thôi là sao??? Nguyễn Ngọc Quý

17.54+13.71+17.46+13.29

= 17.(54+46)+13.(71+29)

=17.100+13.100

=100.(17+13)

=100.30

=3000

Tất cả mũ 2 hay mỗi 11 mũ 2 thoi ạ ?

giúp tớ gấp lắm á

=377+121 : 121

= 377 +1

=378

thiếu r

4,25 . 5 .20

=425

\(425\)

a) = (50-1)^2 = 50^2 - 2.50 + 1 = 2500 - 100 + 1 = 2401

b) = (50+1)^2 = 50^2 + 2.50 + 1 = 2601

c) = 9900

a) \(\left(-48\right)+10+\left(-22\right)+\left(-10\right)\)

\(=\left[\left(-48\right)+\left(-22\right)\right]+\left(-10+10\right)\)

\(=-70+0=-70\)

Tham khảo <3

= -70 

( hihi )

(-48)+(-22)+(10-10)

=-70 +0

=-70

\(a.75^2-50.75+25^2\\ =75^2-2.25.75+25^2\\ =\left(75-25\right)^2=50^2=2500\)

\(b.103.97\\ =\left(100+3\right)\left(100-3\right)\\ =100^2-3^2\\ =9991\)

\(a,75^2-50.75+25^2\\ =75^2-2.75.25+25^2\\ =\left(75+25\right)^2=100^2=10000\\ b,103.97\\ =\left(100+3\right).\left(100-3\right)\\ =100^2-3^2=10000-9=9991\)

a) \(75^2-2\cdot25\cdot75+25^2\)

= \(\left(75+25\right)^2\)

= \(100^2=10000\)
b) \(103\cdot97\)

= \(\left(100+3\right)\left(100-3\right)\)

= \(100^2-3^2\)

= \(10000-9=9991\)