623+x=1019
413+(x+9)=1994
519+(73-X)=563
936+(49:X)=943
26+(X12)=98
49+(X:17)=51
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Ta có:
49 x 62 + 38 x 73 + 31 x 51 x 2 + 19 x 27 x 2
= 49 x 62 + 38 x 73 + 62 x 51 + 38 x 27
= 62 x ( 49 + 51 ) + 38 x ( 73 + 27 )
= 62 x 100 + 38 x 100
= ( 38 + 62 ) x 100
= 100 x 100
= 10 000
49x62+38x73+31x51x2+19x27x2
= 3038+2774+3162+1026
=10000
k cho mk nha bn! :)
a) 73 x 49 + 73 x 51 b) 22344 x 36 + 44688 x 82 c) 3 x 18 x 12 + 4 x 82 x 9 d) 36 x 28 + 36 x 82 +64 x 69 + 64 x 41
= 73 x (49 + 51) =804384 + 3664416 = 648 + 2952 = 36 x (28 + 82) + 64 x (69 + 41)
=73 x 100 =4468800 = 3600 = 36 x 110 + 64 110
=7300 = 110 x (36 x 64)
= 110 x 100
= 11000
`@` `\text {Ans}`
`\downarrow`
`2023 \times 14 + 2023 \times 83+97`
`= 2023 \times (14+83) + 97`
`= 2023 \times 97 + 97`
`= 196231 +97`
`= 196328`
`78 \times 31+78 \times 24+78 \times 17+78 \times 22 \times 72`
`= 78 \times (31+24+17+22 \times 72)`
`= 78 \times (31+24+17+1584)`
`= 78 \times 1656`
`= 129168`
`371 \times 69+371 \times 14+629 \times 83`
`= 371 \times (69+14) + 629 \times 83`
`= 371 \times 83 + 629 \times 83`
`= 83 \times (371+629)`
`= 83 \times 1000`
`= 83000`
`91 \times 51+49 \times 163-49 \times 72`
`= 91 \times 51 + 49 \times (163-72)`
`= 91 \times 51+49 \times 91`
`= 91 \times (51+49)`
`= 91 \times 100`
`= 9100`
`3 \times 12 \times 17 + 4 \times 9 \times 81 + 2 \times 6 \times 6`
`= 9 \times 4 \times 17 + 4 \times 9 \times 81 + 4 \times 9 \times 2`
`= 9 \times 4 \times (17+81+2)`
`= 36 \times 100`
`= 3600`
`42 \times 17 + 58 \times 83 \times 42 \times 83 + 42 \times 83 + 17`
`= 17 \times (42+58) + 42 \times 83 \times (58 \times 83 +1)`
`= 17 \times 100 + 3486 \times 4815`
`= 1700 + 16785090`
`= 16786790`
1) x : 7 + 20 = 17 x 49 + 17 x 51
x : 7 +20 = 17 x ( 49+51)
x : 7 +20 =1700
x : 7 = 1700 - 20 =1680
x = 1680 x 7 =11 760
2) 287 - ( x+ 34) x 3 - 25 = 142
287-(x+34)x3 = 142 + 25 =167
( x+34) x 3 = 287 - 167=120
x + 34 = ``120 : 3 =40
x = 40 - 34 = 6
3)13x + 15x + 12x = 120
40x = 120
x = 120 : 40 = 3
a: \(=-25\cdot4-27=-100-27=-127\)
b: \(=-65:\left(-13\right)-25\cdot4=5-100=-95\)
c: \(=100\cdot\left(-47\right)+53\cdot\left(-100\right)=100\cdot\left(-100\right)=-10000\)
d: \(=\left[\left(-3\right)^{13}:3^{10}-73\right]:\left(-5\right)^2-14\)
\(=\left(-100\right):25-14=-4-14=-18\)
2 x 18 x 14 + 3 x 17 x 12 + 4 x 69 x 9
= { 2 x 18 } x 14 + { 12 x 3 } x 17 + { 4 x 9 } x 69
= 36 x 14 + 36 x 17 + 36 x 69
= 36 x { 14 + 17 + 69 }
= 36 x 100
= 3600
2 × 18 × 14 + 3 × 17 × 12 + 4 × 69 × 9
= 2 × 18 × 14 + 3 × 12 × 17 + 4 × 9 × 69
= 36 × 14 + 36 × 17 + 36 × 69
= 36 × (14 + 17 + 69)
= 36 × 100
= 3600
623+x=1019
x=1019-623
x=396
413+(x+9)=1994
(x+9)=1994-413
x+9=1581
x=1581-9
x=1572
519+(73-x)=563
72-x =563 - 519
72- x=44
x=72-44
x=28
CÁC BẠN GIÚP MÌNH NHANH NHÉ!