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15 × (4 - 7) - 15 × (5 - 3)
= 15 × (-3) - 15 × 2
= 15 × (-3 - 2)
= -15 × 5
= -75
--------
73 × (8 - 59) - 59 × (8 - 73)
= 73 × 8 - 73 × 59 - 59 × 8 + 59 × 73
= 8 × (73 - 59) + 73 × (59 - 59)
= 8 × 14 + 73 × 0
= 8 × 14
= 112
15 x (4-7) - 15 x (5-3)
= 15 x (-3) - 15 x (-2)
= 15 x (-3 - (-2))
= 15 x (-1)
= -15
73 x (8-59) - 59 x (8-73)
= 73 x 8 - 59 x 73 - 59 x (-65)
= 73 x 8 - 59 x (73 - (-65))
= 73 x 8 - 59 x 8
= 8 x (73-59)
= 8 x 14
= 112
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A\(-73+\left(25-49+73\right)-\left(35-59\right)\)
\(=-73+\left(-24+73\right)-\left(-24\right)\)
\(=-73+49-\left(-24\right)\)
\(=-24-\left(-24\right)=0\)
B\(\left(-145+33\right)-\left(33-145\right)-17\)
\(=-112-\left(-112\right)-17=0-17=-17\)
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a) 59 . 73 - 302 +27 . 59
=59x(73+27)-302
=59x100-302
=5900-900
=5000
b) 1560 : [5 . 79 -( 125 + 5. 49) + 5. 21]
=1560:[5.79-(125+245)+5.21)
=1560:[5.(79+21)-(125+245)
=1560:[500-370]
=1560:130
=12
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a) \(199\left(15-17\right)-199\left(-17+5\right)\)
\(=199.15-199.17+199.17-199.5\)
\(=199.\left(15-5\right)\)
\(=199.10=1990\)
b) \(73\left(8-59\right)-59\left(8-73\right)\)
\(=73.8-73.59-59.8+59.73\)
\(=8\left(73-59\right)\)
\(=8.14=112\)
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mình phân phối rồi nhưng rắc rối lắm, bn làm giúp mình 1 câu thôi nhé
ban hay su dung quy tac chuyen ve de pha ngoac sau do lay 73 +(-73) roi lan luot su dung tinh chat phan phoi se giai,
dap an 112
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159.(18-59)-59.(8-73)=159.(-41)-59.(-65)
=(100+59).(-41)-59.(-65)
=100.(-41)+59.(-41)-59.(-65)
=(-4100)+59.[(-41)-(-65)]
=(-4100)+1416
=-2684
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a) \(73\left(8-59\right)-59\left(8-73\right)\)
\(=73.8-73.59-59.8+59.73\)
\(=8.\left(73-59\right)\)
\(=8.14=112\)
b) \(199\left(15-17\right)-199\left(-17+5\right)\)
\(=199.15-199.17+199.17-199.5\)
\(=199.\left(15-5\right)\)
\(=199.10=1990\)
a) 73.(8-59) - 59.(8-73)
= 73 . 8 - 73 . 59 - 59 . 8 + 59 . 73
= - 73 . 59 + 59 . 73 + 73 . 8 - 59 . 8
= 0 + 8 ( 73 - 59 )
= 8 . 14
= 112
b)199.(15-17) - 199.( -17 + 5 )
= 199 . 15 - 199 . 17 - 199 . (- 17 ) + ( - 199 ) . 5
= 199 . 15 - 19 . 17 + 199 . 17 + ( - 199 ) . 5
= 199 . 15 - 0 + 199 . ( - 5 )
= 199 . [ 15 - ( - 5 ) ]
= 199 . 10
= 1990
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73.(8-59)-59.(8-73)
=73.8-73.59-59.8+59.73
=(73.8-59.8)+(73.59-59.73)
=8.(73-59)+0
=8.14+0=112+0=0
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a,
73.( 8 - 59 ) - 59.( 8 - 73 )
=73.8 -73. 59 - 59.8 - 73.59
=8(73-59)-73(59-59)
=8.14-0
=112
b,Tương tự câu a
c,Tương tự câu a
a) 73 . ( 8 - 59 ) - 59 . ( 8 - 73) b) 159 . ( 18 - 59 ) - 59. ( 18 - 159 ) c) - 145 . ( 13 - 57 ) + 57. ( 10 - 145 )
= 73 . 8 - 73 . 59 - 59 .8 - 59 .73 = 159 . 18 - 159 . 59 - 59 . 18 - 59 . 159 = ( - 145 ) . 13 - (- 145) . 57 + 57 . 10 -57.145
= 8 . ( 72 - 59 ) - 73 . ( 59 - 59 ) = 18 . (159 - 59 ) - ( 59 - 59) - ( 159 - 159) =(-145).13-(-145).57+57.(10-145)
= 8 . 14 - 0 = 1800 - 0 - 0 = (-145).13- (-145).57 + (-135)
= 112 = 1800 = -145.(13 - 57) + (-135)
=6380 + (-135 )
=6245
59.(49 - 73) - 49.(59-73)
= 59.49 - 59.73 - 49.59 - 49.73
= ( 59.49) - ( 49.59) - [ 73. ( 59 - 49 )]
= 0 - ( 73.10 )
= 0 - 730
= - 730.
=-730