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(111:x+25):14=2
=> 111:x+25=2.14
=> 111:x+25=28
=> 111:x=28-25
=> 111:x=3
=> x=111:3
=> x=37
[(6x-39):3].28=5628
=> (6x-39):3=5628:28
=> (6x-39):3=201
=> 6x-39=201.3
=> 6x-39=603
=> 6x=603+39
=> 6x=642
=> x=642:6
=> x=107
400-[545-(45+x)]=0
=> 545-(45+x)=400-0
=> 545-45-x=400
=> 500-x=400
=> x=500-400
=> x=100
(111:x+25):14=2
111 : x + 25 = 2 . 14 = 28
111 : x = 28 - 25 = 3
x = 111 : 3
x = 37
[(6x-39):3] .28=5628
( 6x - 39 ) : 3 = 5628 : 28 = 201
6x - 39 = 201 . 3 = 603
6x = 603 + 39 = 642
x = 642 : 6
x = 107
400-[545-(45+x)]=0
545 - ( 45 + x )=400
45 + x = 545 - 400 = 145
x = 145 - 45
x = 100
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[ 545 - ( 45 + 4 . 25) ] : 50 - 2000 : 250 + 215 : 213
= [ 545 - ( 45 + 100 ) ] : 50 - 8 + 22
= ( 545 - 145 ) : 50 - 8 + 4
= 400 : 50 - 8 + 4
= 8 - 8 + 4
= 0 + 4
= 4
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a ) [ 168 .168 - 168 . 58 ] : 110
= [ 168 . ( 168 - 58 ) ] : 110
= 168 . 110 : 110
= 168 .1
= 168
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1045 + 57 - 1045 - 67
= ( 1045 - 1045 ) + ( 57 - 67 ) [_Tự lm tiếp_]
1890 - 456 - 434
= 1890 - ( 456 + 434 )
= 1890 - 890 [_Tự lm tiếp_]
-45 + 189 - 155
= 189 - ( 45 + 155 )
= 189 - 200 [_Tự lm tiếp_]
-127 + 34 - 73 + 166
= ( -127 + -73 ) + ( 34 + 166 ) [_Tự lm tiếp_]
-15 - 17 + 29 + 15 - 83
= ( -15 + 15 ) - ( 17 - 29 + 83 ) [_Tự lm tiếp_]
-45 + 140 - (-45) - 240
= [ -45 - ( -45 ) ] + ( 140 - 240 ) [_Tự lm tiếp_]
-75 + (-89) + (-75) + 89 - 122
= [ -75 + ( -75 ) ] + [ ( -89 ) + 89 ] - 122 [_Tự lm tiếp_]
P/s: Hoq chắc_:333
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545 - (45+4.25) = 545 - 145 = 400
400/50 - 200/250 + 2^15 : 2^13
= 8 - 80/100 + 2^2
= 8 - 0.8 + 4
= 12 - 0.8 = 11.2
[545-(45+4.25)]:50-200:250+2 mũ 15:2 mũ 13
=[545-(45+100)]:50-200:250+2 mũ 15:2 mũ 13
=[545-145]:50-200:250+2 mũ 15 : 2 mũ 13
=400:50-200:250+2 mũ 15 : 2 mũ 13
=8-0,4+2 mũ 2
=7,6+2 mũ 2
=7,6+4
=11,6
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123x456456+123123x456=56144088+56144088=112288176
45x48+90x24+145=2160+2160+145=4465
123 . 456456 + 123123 . 456
=123 . 456 . 1001 + 123 . 456 .1001
=123 . 456 . 1001 . 2
=56088 . 2002
=112288176
45 . 48 + 90 . 24 + 145
=45 . 2 . 24 + 90 . 24 + 145
=90 . (24+24) + 145
=90 . 48 + 145
=4320 + 145
=4465
chúc bạn học tốt nha
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[545 - ( 45 + 22+ 52)] : 50 - 2 . 103 : 250 + 215 : 213
=[545 - ( 45 + 4+ 25)] : 50 - 2 . 1000 : 250 + 215 : 213
=[545 - ( 49+ 25)] : 50 - 2 . 1000 : 250 + 215 : 213
=(545 - 74) : 50 - 2 . 1000 : 250 + 215 : 213
=471 : 50 - 2 . 1000 : 250 + 215 : 213
=9,42 - 2 . 1000 : 250 + 215 : 213
=9,42 - 2000 : 250 + 215-13
=9,42 - 8 + 22 =17,42 + 4 =21,42
à cuối cùng vẫn ra thông cảm nhé
[545 - ( 45 + 22+ 52)] : 50 - 2 . 103 : 250 + 215 : 213
=[545 - ( 45 + 4+ 25)] : 50 - 2 . 1000 : 250 + 215 : 213
=[545 - ( 49+ 25)] : 50 - 2 . 1000 : 250 + 215 : 213
=(545 - 74) : 50 - 2 . 1000 : 250 + 215 : 213
=471 : 50 - 2 . 1000 : 250 + 215 : 213
=9,42 - 2 . 1000 : 250 + 215 : 213
=9,42 - 2000 : 250 + 215-13
=9,42 - 8 + 22
=17,42 + 4
=21,42