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d) 135(-12 + 247) - 147(135 - 12)= -12.135 + 135.147 - 147.135 + 12.147 = (-12.135 + 12.147) + (135.147 - 147.135) = 12(-135 + 147) + 0 = -12.12 = -144
Bài 1:
a) [3.(-2) - (-8)].(-7) - (-2).(-5) = -7(-6 + 8) - 2.5= -7.2 - 2.5 = -2(7 + 5) = -2.12 = -24
a, =-25.21.4.(-3).(-1)
=-25.4.21.4
=-100.21.4
=-2100.4
=-8400
b, =-125.67.(-8).1
=-125.(-8).67
=1000.67
=67000
c, =35.18-35.28
=35.(18-28)
=35.(-10)
=-350
d, =24.11-16.24+16.5
=24.(11-16)+16.5
=24.(-5)+16.5
=5.(-24+16)
=5.(-8)
=-40
e, =29.6-19.29+19.13
=29.(6-19)+19.13
=29.(-13)+19.13
=13.(-29+19)
=13.(-10)
=-130
35 . 18 - 5 . 7 . 28
= 35.18-5.7.28
= 35 . 18 - 35 . 28
= 35 . ( 18 - 28 )
= 35 . ( - 10 )
= -350
D. 24.(16-5)-16.(24-5)
= 24 . 11 - 16 . 19
= 264 - 304
= -30
a,( 25 + 39 ) +21 = 25 + ( 39 + 21 ) = 25 + 60 =85
b,( 997+29 +3 +51)= ( 997 + 3 ) + ( 29 + 51 ) = 1000 + 80 = 1080
c. 578 + 125 + 422 + 375 = ( 578 + 422 ) + ( 125 + 375 ) = 1000 + 500 = 1500
d.915 + 85 + 117 + 23 = ( 915 + 85 ) + ( 117 + 23 ) = 1000 + 140 = 1140
\(2575+37-2576-29\)
\(=2612-2576-29\)
\(=36-29=7\)'
\(35+35+36+37-14-15-16-17\)
\(=70+\left(36-16\right)+\left(37-17\right)-14-15\)
\(=70+20+20-14-15\)
\(=90+6-15\)
\(=96-15=81\)
\(13\cdot\left(-12\right)+87.\left(-12\right)\)
\(=\left(-12\right)\cdot\left(13+87\right)\)
\(=\left(-12\right)\cdot100=-1200\)
\(26\cdot17+17\cdot74\)
\(=\left(26+74\right)\cdot17\)
\(=100\cdot17=1700\)
\(25\cdot\left(-18\right)+25\left(-82\right)\)
\(=25\cdot\left[\left(-18\right)+\left(-82\right)\right]\)
\(=25\cdot\left(-100\right)=\left(-2500\right)\)
\(25+37-48-25-37\)
\(=\left(25-25\right)+\left(37-37\right)-48\)
\(=0+0-48\)
\(=0-48=\left(-48\right)\)
\(\left(-16\right)+24+16-34\)
\(=\left[\left(-16\right)+16\right]+\left(24-34\right)\)
\(=0+\left(-10\right)=\left(-10\right)\)
a) 29 - [16 + 3 . (51 - 49)]
= 29 - [ 16 + 3 . 2 ]
= 29 - [ 16 + 6 ]
= 29 - 22
= 7.
b) 47 - [(45 . 16 - 25 . 12) : 14]
= 47 - [ (720 - 300 ) : 14 ]
= 47 - [ 420 : 14 ]
= 47 - 30
= 17.
c) 100 - [60 : (125 : 25 - 3 . 5)]
= 100 - [ 60 : (5 - 3.5) ]
= 100 - [ 60 : ( 5 - 15) ]
= 100 - [60 : (-10) ]
= 100 - (-6)
= 100 + 6
= 106.
d) 2345 - 1000 : [19 - 5(21 - 18)]
= 2345 - 1000 : [ 19 - 5. 3 ]
= 2345 - 1000 : [ 19 - 15 ]
= 2345 - 1000 : 4
= 2345 - 250
= 2095
# HOK TỐT #
a)29-[16 + 3 . (51 - 49)]
=29 - [ 16 + 3 . 2]
=29 - [16 + 6 ]
=29 - 22
=7
b) 47 - [(45 . 16 - 25 . 12) : 14]
= 47 - [( 45 . 16 - 25 .12) : 14]
=47 - [(720 - 300) : 14]
=47 - [420 : 14]
=47 - 30
= 17
c) 100 - [60 : (125 : 25 - 3 . 5)]
= 100 - [ 60 : ( 5 - 15 )]
=100 - [60 : (- 10)]
= 100 - (- 6)
=94
d) 2345 - 1000 : [19 - 5(21 - 18)]
=2345 - 1000 : [ 19 -5 . 3]
=2345 - 1000 : [19 - 15]
= 2345 - 1000 : 4
=2345 - 250
=2095