1: =66+34-73-27+99=99

2: =54-45+30-54-30+5=-40

3: =42-56+33-33+56-42=0

4: =50-47-50+18+47-18=0

5: =10-28+30-4=2-4+10=12-4=8

\(\text{1.-(-66)+34+(-73)-27+99}.\)

\(=66+34-73-27+99=100-100+99=-99.\)

\(\text{2.54-(45-30+54)-30+5}.\)

\(54-45+30-54-30+5=\left(54-54\right)+\left(-45+5\right)+\left(30-30\right)=-40.\)

\(\text{3.42-56+33-(33-56+42)}.\)

\(=42-56+33-33+56-42=\left(42-42\right)+\left(-56+56\right)+\left(33-33\right)=0.\)

\(\text{4.50-(47+50-18)+(47-18)}.\)

\(=50-47-50+18+47-18=\left(50-50\right)+\left(-47+47\right)+\left(18-18\right)=0.\)

\(\text{5.10-(28-30+4)}.\)

\(=10-28+30-4=10+30-20-8-4=20-12=8.\)

\(\text{6.-(-73)+(44-94+27)+94}.\)

\(=73+44-94+27+94=\left(73+27\right)+\left(-94+94\right)+44=100+44=144.\)

300

465 

nhiều thế bn ;-;

9 câu chứ nhiêu nhóc=))

bn ghi dấu ra nha!!Chứ mik nhìn mik ko hỉu j lun

\(17\times109-17\times53+56\times96-13\times56\)

\(=17\times\left(109-53\right)+56\times\left(96-13\right)\)

\(=17\times56+56\times83\)

\(=56\times\left(17+83\right)\)

\(=56\times100\)

\(=5600\)

\(8\times27\times3+2\times31\times12+6\times12\times4\)

\(=24\times27+24\times31+24\times12\)

\(=24\times\left(27+31+12\right)\)

\(=24\times70\)

\(=1680\)

\(15\times47+15\times33+60\times39+60\times41\)

\(=15\times\left(47+33\right)+60\times\left(39+41\right)\)

\(=15\times80+60\times80\)

\(=80\times\left(15+60\right)\)

\(=80\times75\)

\(=6000\)

\(97\times59-59\times31-66\times49\)

\(=59\times\left(97-31\right)-66\times49\)

\(=59\times66-66\times49\)

\(=66\times\left(59-49\right)\)

\(=66\times10\)

\(=660\)

Học tốt

a) 3 x 4 + 3 x 56

= 3 x (4 + 56)

= 3 x 60

= 180

b) 34 x 56 + 34 x 59

= 34 x (56 + 59)

= 34 x 115

= 34 x 100 + 34 x 10 + 34 x 5

= 3400 + 340 + 170

= 3910

a)

3*4+3*56

=3*(56+4)

=3*60=180

b)34*56+34*59

=34*(56+59)

=34*115

=3910

- 16 + 45 - 37 - 23 - 32

= 29 - 37 - ( - 9 ) 

= ( - 8 ) - ( - 9 )

= 1

Phần kia bạn tự làm nhé

- 16 + 45 - 37 - 23 + 32 = 1

56 + 35 + 23 + 34 - 18 = 130

mik nha 

tks bn nhiều