72 * (56 + 44) + 12 * (44 + 56)

= 72 * 100 + 12* 100

= 7200 + 1200

= 8400

72.56 - 12.44 + 72.44 - 12.56 = 72.(56 + 44) - 12.(44 + 56) = 72.100 - 12.100 = 100.(72 - 12) = 100.60 = 6000

72 . 56 - 12 . 44 + 72 . 44 - 12 . 5

=72 x (56 + 44) + 12 x (44 + 56)

= 72 x 100 + 12 x 100

= 7200 + 1200

= 8400

ai giải cho tui đi

\(888-\left(-333\right)-222+70\)

\(=888+\left(333-222\right)+70\)

\(=888+111+70\)

\(=999+70\)

\(=1069\)

\(-97-15+44-35-12+56\)

\(=\left(-97-15-35-12\right)+\left(44+56\right)\)

\(=-159+100\)

\(=-59\)

[44-(56-x)].12=384

44-(56-x)=32

56-x=12

x=44

[44- (56-x) ] . 12 = 384

<=> (44-56+x) . 12 = 384

<=> (-12 + x) . 12  = 384

<=> 12x - 144       = 384

<=> 12x               = 384 + 144

<=> 12x               = 528

<=>    x                = 528 : 12

<=>    x                = 44

Vậy x = 44

500 nha

1+88+99+12+33+67+44+56+100

=(1+99)+(88+12)+(33+67)+(44+56)+100

=100+100+100+100+100

=100x5

=500

A 12x56 + 12x44 =44+56=100

100X56=5600

b 45x12-45x2+45x90=90+2-12=80

80x45=3600

a) 12 x 56 + 12 x 44

=12.(56+44)

=12.100

=1200

b) 45 x 12 - 45 x 2 + 45 x 90

=45.(12-2+90)

=45.100

=4500

12+44+45+56+55+88+91+27+9+73

=(12+88)+(44+56)+(45+55)+(91+9)+(27+73)

=   100   +   100   +   100  +  100   +   100

=              100    x    5

=                     500

Chúc bạn học tốt!

Trả lời : 

=500

ủng hộ nha

\(56+44=100\)

\(44+56=100\)

56 + 44 = 100

44 + 56 = 100

56 + 44 + 44 + 56 = 200

ủng hộ mk nha mọi người

\(56+44+44+56\)

\(=\left(56+44\right)+\left(56+44\right)\)

\(=100+100\)

\(=100.2\)

\(=200\)