* 1999 - 2000 + 2999 - 3000 + 3999 - 4000 + 4999 - 5000 + 5999 – 1000 T×m X * X x 5 + 122 + 236 = 633 * 320 + 3 x X = 620 * 357 : X = 5 d 7 * X : 4 = 1234 d 3 * 120

tramycuccute123456789

2 năm trước

* 1999 - 2000 + 2999 - 3000 + 3999 - 4000 + 4999 - 5000 + 5999 – 1000 T×m X * X x 5 + 122 + 236 = 633 * 320 + 3 x X = 620 * 357 : X = 5 d 7 * X : 4 = 1234 d 3 * 120 - ( X x 3 ) = 30 x 3 * 357 : ( X + 5 ) = 5 d 7 * 65 : x = 21 d 2 * 64 : X = 9 d 1 * ( X + 3) : 6 = 5 + 2 * X x 8 - 22 = 13 x 2 * 720 : ( X x 2 + X x 3 ) = 2 x 3 * X+ 13 + 6 x X = 62 * 7 x ( X - 11 ) - 6 = 757 * X + ( X + 5 ) x 3 = 75 * 4 < X x 2 < 10 * 36 > X x 4 > 4 x 1 * X + 27 + 7 x X = 187 * X + 18 + 8 x X = 99 * ( 7 + X ) x 4 + X = 108 * ( X + 15 ) : 3 = 3 x 8 * ( X : 12 ) x 7 + 8 = 36 * X : 4 x 7 = 252 * ( 1+ x) +( 2 + x) + ( 3 + x) + ( 4 + x ) + ( 5 + x) = 10 x 5 * ( 8 x 18 - 5 x 18 - 18 x 3 ) x X + 2 x X = 8 x 7 + 24

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vietdungletrong

Bài 1:

`1999-2000+2999-3000+3999-4000+4999-5000+5999-1000`

`=(1999-1000)+(2999-2000)+(3999-3000)+(4999-4000)+(5999-5000)`

`=999+999+999+999+999+999`

`=999×5`

`=4995`

Bài 2:

`1)x×5+122+236=633`

`x×5+358=633`

`x×5=633-358`

`x×5=275`

`x=275:5`

`x=55`

`2)320+3×x=620`

`3×x=620-320`

`3×x=300`

`x=300:3`

`x=100`

`3)357:x=5(dư` `7)`

`x=(357-7):5`

`x=350:5`

`x=70`

`4)x:4=1234(dư` `3)`

`x=(1234×4)+3`

`x=4936+3`

`x=4939`

`5)120-(x×3)=30×3`

`120-(x×3)=90`

`x×3=120-90`

`x×3=30`

`x=30:3`

`x=10`

`6)357:(x+5)=5(dư` `7)`

`x+5=(357-7):5`

`x+5=350:5`

`x+5=70`

`x=70-5`

`x=65`

`7)65:x=21(dư` `2)`

`x=(65-2):21`

`x=63:21`

`x=3`

`8)64:x=9(dư` `1)`

`x=(64-1):9`

`x=63:9`

`x=7`

`9)(x+3):6=5+2`

`(x+3):6=7`

`x+3=7×6`

`x+3=42`

`x=42-3`

`x=39`

`10)x×8-22=13×2`

`x×8-22=26`

`x×8=26+22`

`x×8=48`

`x=48:8`

`x=6`

`11)720:(x×2+x×3)=2×3`

`720:(x×2+x×3)=6`

`x×2+x×3=720:6`

`x×2+x×3=120`

`x×(2+3)=120`

`x×5=120`

`x=120:5`

`x=24`

`12)x+13+6×x=62`

`x+6×x+13=62`

`x+6×x=62-13`

`x+6×x=49`

`x×(1+6)=49`

`x×7=49`

`x=49:7`

`x=7`

`13)7×(x-11)-6=757`

`7×(x-11)=757+6`

`7×(x-11)=763`

`x-11=763:7`

`x-11=109`

`x=109+11`

`x=120`

`14)x+(x+5)×3=75`

`x+3×x+3×5=75`

`x+3×x+15=75`

`4×x+15=75`

`4×x=75-15`

`4×x=60`

`x=60:4`

`x=15`

`15)4<x×2<10`

`⇔4/2<(x×2)/2<10/2`

`⇔2<x<5`

`⇒x∈{3;4}`

`16)36>x×4>4×1`

`⇔36/4>(x×4)/4>(4×1)/4`

`⇔9>x>1`

`⇒x∈{8;7;6;5;4;3;2}`

`17)x+27+7×x=187`

`(x+7×x)+27=187`

`x×(1+7)+27=187`

`x×8+27=187`

`x×8=187-27`

`x×8=160`

`x=160:8`

`x=20`

`18)x+18+8×x=99`

`(x+8×x)+18=99`

`x×(1+8)+18=99`

`x×9+18=99`

`x×9=99-18`

`x×9=81`

`x=81:9`

`x=9`

`19)(7+x)×4+x=108`

`4×7+4×x+x=108`

`28+5×x=108`

`5×x=108-28`

`5×x=80`

`x=80:5`

`x=16`

`20)(x+15):3=3×8`

`(x+15):3=24`

`x+15=24×3`

`x+15=72`

`x=72-15`

`x=57`

`21)(x:12)×7+8=36`

`(x:12)×7=36-8`

`(x:12)×7=28`

`x:12=28:7`

`x:12=4`

`x=4×12`

`x=48`

`22)x:4×7=252`

`x:4=252:7`

`x:4=36`

`x=36×4`

`x=144`

`23)(1+x)+(2+x)+(3+x)+(4+x)+(5+x)=10×5`

`1+x+2+x+3+x+4+x+5+x=50`

`(1+2+3+4+5)+(x+x+x+x+x)=50`

`15+5×x=50`

`5×x=50-15`

`5×x=35`

`x=35:5`

`x=7`

`24)(8×18-5×18-18×3)×x+2×x=8×7+24`

`[18×(8-5-3)]×x+2×x=56+24`

`(18×0)×x+2×x=80`

`0×x+2×x=80`

`2×x=80`

`x=80:2`

`x=40`

Vote (0) Phản hồi (0) 2 năm trước

Dieptung200897

T×m X

* X x 5 + 122 + 236 = 633

X =275 :5

x=55

* 320 + 3 x X = 620

x=300:3

x=100

* 357 : X = 5 d 7

X=(357-7):5

x = 70

* X : 4 = 1234 d 3

x= (1234:4) +3

x=4939

* 120 - ( X x 3 ) = 30 x 3

x=30:3

x=10

* 357 : ( X + 5 ) = 5 d 7

x=65

* 65 : x = 21 d 2

x= 3

* 64 : X = 9 d 1

x=7

* ( X + 3) : 6 = 5 + 2

x=39

* X x 8 - 22 = 13 x 2

x=6

* 720 : ( X x 2 + X x 3 ) = 2 x 3

x=24

* X+ 13 + 6 x X = 62

* 7 x ( X - 11 ) - 6 = 757

* X + ( X + 5 ) x 3 = 75

x= 9

* X + 27 + 7 x X = 187

x=16

* X + 18 + 8 x X = 99

x=57

* ( 7 + X ) x 4 + X = 108

x=48

* ( X + 15 ) : 3 = 3 x 8

x=144

* ( X : 12 ) x 7 + 8 = 36

x=7

* X : 4 x 7 = 252

x = 252 : 28

x=144

* ( 1+ x) +( 2 + x) + ( 3 + x) + ( 4 + x ) + ( 5 + x) = 10 x 5

X=7

* ( 8 x 18 - 5 x 18 - 18 x 3 ) x X + 2 x X = 8 x 7 + 24

x=40

do thêm cái này

* 1999 - 2000 + 2999 - 3000 + 3999 - 4000 + 4999 - 5000 + 5999 – 1000

=999x4 +1999-1000

=4995

mình lười quá nên tính máy tính

Vote (0) Phản hồi (0) 2 năm trước

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