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a.=137x(6+4)
=137x10
=1370
b.=1275x(135-35)
=1275x100
=127500
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Bài thứ nhất
\(x\times5=4765\)
\(x\) \(=4765\div5\)
\(x\) \(=953\)
Bài thứ hai
\(x\div8=1234\)
\(x\) \(=1234\times8\)
\(x\) \(=9872\)
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a) 1 + 2 + 3 + ....... + x = 1275
<=> ( x + 1 ) . x : 2 = 1275
( x + 1 ) . x = 1275 .2
( x + 1 ) . x = 2550
( x + 1 ) . x = 51 . 50
( x + 1 ) . x = ( 50 + 1 ) . 50
<=> x = 50
b) ( x + 1 ) +( x + 2 ) +..... +( x + 99 ) = 6138
x + 1 + x + 2 + .........+ x + 99 = 6138
99x + ( 1 + 2 + .......... + 99 ) = 6138
99x + 4950 = 6138
99x = 1188
x = 1188 : 99
x = 12
c) x . 1 + x . 2 + ......... + x . 99 = 495
x. ( 1 + 2 + ...... + 99 ) = 495
x . 4950 = 495
x = 495 : 4950
x = 1/10
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738 : ( x - 289 ) = 36
x - 289 = 738 : 36
x - 289 = \(\dfrac{41}{2}\)
x = \(\dfrac{41}{2}+289\)
x = \(\dfrac{619}{2}\)
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1234 x 45 - 1234 x 35 + 23450
= 1234 x ( 45 - 35 ) + 23450
= 1234 x 10 + 23450
= 12340 + 23450
= 35790
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1000x5 + 200x5 + 30x5 + 4x5
=5000 + 1000 + 150 + 20
= 6000 +170
=6170
\(a,x=1275:5\\ =>x=255\\ b,x:4=1234\\ =>x=1234\times4=4936\\ c,54361+x=57817\\ =>x=57817-54361\\ =>x=3456\\ d,738:x=9\\ =>x=738:9\\ =>x=82\)
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