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`@` `\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`
e) 2+4+6+8....+24
số hạng
(24-2):2+1=10
tổng
(24+2)x10:2=130
đ\s....
a) 100 - 9 : ( 372 : 3 .y - 1 ) -14 = 83
100 - 9 : ( 372 : 3 . y - 1 ) = 83 + 14
100 - 9 : ( 372 : 3 . y - 1 ) = 97
9 : ( 372 : 3 . y - 1 ) = 100 - 97
9 : ( 372 : 3 . y - 1 ) = 3
372 : 3 . y - 1 = 9 : 3
372 : 3 . y - 1 = 3
372 : 3 . y = 3 + 1
372 : 3 . y = 4
3 . y = 372 : 4
3 . y = 93
y = 93 : 3
y = 31
\(100-9:\left(372:3.y-1\right)-14=83\)
\(100-9:\left(372:3.y-1\right)=97\)
\(9:\left(372:3.y-1\right)=3\)
\(\left(372:3.y-1\right)=3\)
\(372:3.y=4\)
\(3.y=93\)
\(y=31\)
\(47\times\left(53-37\right)-53\times\left(47-37\right)\)
\(=47\times53-47\times37-53\times47+53\times37\)
\(=\left(47\times53-53\times47\right)+\left(53\times37-47\times37\right)\)
\(=0+\left(53-47\right)\times36=6\times36\)
\(=216\)
83 . 27 + 83 . 35 + 17 . 62
= 83 ( 27 + 35 ) + 17 . 62
= 83 . 62 + 17 . 62
= 62 ( 83 + 17 )
= 62 . 100
= 6200
83 x 27 + 83 x 35 + 17 x 62
= 83 x ( 27 + 35 ) + 17 x 62
= 83 x 62 + 17 x 62
= 62 x ( 83 + 17 )
= 62 x 100
= 6200
1×1×83×24+83
= 1x83x24+83
= 83x24+83
= 83x24+83x1
= 83x(24+1)
= 83x25
=
= 2075 nha