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a. x + 2005 = 123 × 45
x + 2005 = 5535
x = 5535 - 2005
x = 3530
b. 1837 + x ÷ 15 = 486 × 23
1837 + x ÷ 15 = 11178
x = 140115
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= 243 x 2 + 5 x 243 + 243 x 2 x 2 - 473
= 243 x (2+5+2x2) - 473
= 243 x 28 - 473
= 6084 - 473
= 6331
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=243x2+4x243+486x2-243
=2x243+5x243+2x2x243-243
=7x243+4x243-1x243
=11x243-1x243
=10x243
=2430
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3 x 45 + 2 x 45 + 4 x 45 + 45
= 3 x 45 + 2 x 45 + 4 x 45 + 45 x 1
= (3 + 2 + 4 + 1) x 45
= 10 x 45
= 450
3 x 45 + 2 x 45 + 4 x 45 + 45
= (3 + 2 + 4 + 1) x 45
= 10 x 45
= 450
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a,486:x-126:x=6
=>(486-126):x=6
=>360:x=6
=>x=360:6
=>x=60
b,725:x+175:x=5
=>(725+175):x=5
=>900:x=5
=>x=900:5
=>x=180
486:x-126:x=6
(486-126):x=6
360:x=6
x=360:6
x=60
725:x+175:x=5
(725+175):x=5
900:x=5
x=900:5
x=180
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( 486 - 126 ) : x = 6
360 : x = 6
x = 360 : 6
x = 60
:)))
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=[(99-1):2+1]x(99+1)x[45x(3-2-1)]
=(50x100)x(45x0)
=5000x0
=0
486 x 45 + 486 x 45
= 486 x ( 45 + 45 )
= 486 x 90
= 486 x ( 100 - 10 )
= 486 x 100 - 486 x 10
= 48 600 - 4 860
= 43 740
486 x 45 + 486 x 45
= 486 x ( 45 + 45 )
= 486 x 90
= 486 x ( 100 - 10 )
= 486 x 100 - 486 x 10
= 48600 - 4860
= 43740
cho 1 k nha bn