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a, 568 + 568 x 135 - 568 x 36
= 568 x ( 1 + 135 - 36)
= 568 x 100
56 800
b, 17 x 49 + 49 x 37 + 54 x 26 + 54 x 25
= 49 x ( 17 + 37) + 54 x ( 26 + 25 )
= 49 x 54 + 54 x 51
= 54 x ( 49 + 51)
= 54 x 100
= 5 400
c, 14 x 35 x 5 + 10 x 25 x 7 + 20 x 70
= ( 2 x 35) x ( 7 x 5) + ( 10 x 7) x 25 + 20 x 70
= 70 x 35 + 70 x 25 + 20 x 70
= 70 x ( 35 + 25 + 20)
= 70 x 80
= 5 600
a) 568 + 568 x 135 - 568 x 36
= 568 x ( 1+1+135-1-36 )
=568 x 100
=5680
b) 17 x 49 + 49 x 37 + 54 x 26 + 54 x 25
= 49 x ( 17 + 37 ) + 54 x ( 26 + 25 )
= 49 x 54 + 54 x 51
= 54 x ( 49 + 51 )
= 54 x 100
= 5400
c) 14 x 35 x 5 + 10 x 25 x 7 + 20 x 70
= 70 x 35 + 10 x 25 x 7+ 20 x 70
= 70 x 35 + 250 x 7 + 20 x 70
= 70 x 35 + 70 x 25 + 20 x 70
= 70 x (35+25+20)
= 70 x 80
= 5600
a) (12-46)+(46+88)
= 12-46+46+88
= (12+88)+[(-46)+46]
= 100+0
=100.
b) (14+67)+(33-14+100)
= 14+67+33-14+100
=[ [14+(-14)]+[(67+33)+100]
= 0+200
= 200.
c) (35+12-47)-(12+53+65)
= 35+12-47-12-53-65
=[12+(-12)]+[(-47)+(-53)]+[35+(-65)]
=0+(-100)+(-30)
=(-100)+(-30)
=-130.
Chúc bạn học tốt !!! 
a) (12-46)+(46+88)=12-46+46+88
=(12+88)-(46-46)=100
b) (14+67)+(33-14+100)=14+67+33-14+100
=(14-14)+100+(67+33)=100+100=200
c) (35+12-47)-(12+53+65)=35+12-47-12-53-65
=(12-12)-(47+53)-(65-35)= -100-30
=-130
(107-49)-(-107+49-54)
=107-49+107-49+54
=58+58+54
=116+54
=170
mình làm ý a hen
25-(30-7)+75-47
=25-(30-7)+28
=25-23+28
=2+28
=30
\(25-\left(30-7\right)+75-47\)
\(=25-30+7+75-47\)
\(=30\)
\(\left(-54-91\right)-\left(59-74\right)\)
\(=-54-91-59+74\)
\(=-130\)
câu kia tương tự nha
a, (27+65)+(346-27-65)
=27+65+346-27-65
=92+346-27-65
=438-27-65
=411-65
=346
b, (42-69+17)-(42+17)
=42-69+17+(-42)-17
=[42+(-42)]+[17+(-17)]-69
=0+0-69
=0-69
=-69
mk nhanh nhật tk mk nhé
78. Bỏ dấu ngoặc rồi tính:
a) (27 + 65) + (346 - 27 - 65); b) (42 - 69 + 17) - (42 + 17).
Bài giải:
a) (27 + 65) + (346 - 27 - 65) = 27 + 65 + 346 - 27 - 65
= 27 - 27 + 65 - 65 + 346 = 346
b) (42 - 69 + 17) - (42 + 17) = 42 - 69 + 17 - 42 - 17
= 42 - 42 + 17 - 17 - 69 = -69
\(\text{1.-(-66)+34+(-73)-27+99}.\)
\(=66+34-73-27+99=100-100+99=-99.\)
\(\text{2.54-(45-30+54)-30+5}.\)
\(54-45+30-54-30+5=\left(54-54\right)+\left(-45+5\right)+\left(30-30\right)=-40.\)
\(\text{3.42-56+33-(33-56+42)}.\)
\(=42-56+33-33+56-42=\left(42-42\right)+\left(-56+56\right)+\left(33-33\right)=0.\)
\(\text{4.50-(47+50-18)+(47-18)}.\)
\(=50-47-50+18+47-18=\left(50-50\right)+\left(-47+47\right)+\left(18-18\right)=0.\)
\(\text{5.10-(28-30+4)}.\)
\(=10-28+30-4=10+30-20-8-4=20-12=8.\)
\(\text{6.-(-73)+(44-94+27)+94}.\)
\(=73+44-94+27+94=\left(73+27\right)+\left(-94+94\right)+44=100+44=144.\)
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
a) (65+27-49) - ( 45+37-19)
= 65+27-49 - 45 -37+19
= (65-45)+ ( 27-37) + (-49+19)
= 20 + (-10) + (-30)
= -20