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\(a,-81.46-81.55+81\)
\(=81.\left(-46\right)-81.55+81\)
\(=81.\left(-46-55+1\right)\)
\(=81.\left(-100\right)\)
\(=-8100\)
\(b,35.\left(17-5\right)-17.\left(35-5\right)\)
\(=35.17-35.5-17.35+17.5\)
\(=\left(35.17-17.35\right)-\left(35.5-17.5\right)\)
\(=35.\left(17-17\right)-5.\left(35-17\right)\)
\(=35.0-5.18\)
\(=0-90\)
\(=-90\)
Cách 2 : \(35.\left(17-5\right)-17.\left(35-5\right)\)
\(=35.12-17.30\)
\(=420-510\)
\(=-90\)
\(c,-125.6.\left(-8\right).\left(-50\right)\)
\(=\left(-125\right).\left(-8\right).6.\left(-50\right)\)
\(=1000.\left(-300\right)\)
\(=-300000\)
1) 37,5.6,5-7,5.3,4-6,6.7,5+3,5.37,5
=(37,5.6,5+3,5.37,5) - (7,5.3,4+6,6.7,5)
=37,5.(6,5+3,5) - 7,5.(3,4+6,6)
=37,5.10-7,5.10
=10.(37,5-7,5)
=10.30
=300
2)-39.121+125+39.21
=-39.21-39.100+125+39.21
=(-39.21+39.21)+(125-39.100)
=0+125-3900
=-3775
3)35.17 - 65.34
=35.17-65.2.17
=35.17-130.17
=17.(35-130)
=17.(-95)
=-1615
a) \(48.19+48.15+134.52\)
\(=48\left(19+15\right)+6968\)
\(=48.34+6968\)
\(=1632+6968\)
\(=8600.\)
b) \(27.121-87.27+73.34\)
\(=27\left(121-87\right)+73.34\)
\(=27.34+73.34\)
\(=34\left(27+73\right)\)
\(=34.100\)
\(=3400.\)
c) \(125.98-125.46-52-25\)
\(=125\left(98-46\right)-52-25\)
\(=125.52-52-25\)
\(=52\left(125-1\right)-25\)
\(=52.124-25\)
\(=6448-25\)
\(=6423.\)
d) \(136.23+136.17-40.36\)
\(=136\left(23+17\right)-40.36\)
\(=136.40-40.36\)
\(=40\left(136-36\right)\)
\(=40.100\)
\(=4000.\)
e) \(66.25+5.66+66.14+33.94\)
\(=33\left(2.50+5.2+14.2+94\right)\)
\(=33\left(50+10+28+94\right)\)
\(=33.182\)
\(=6006.\)
Câu 1:
MSC=60
7/10=7.6/10.6=42/60 5/-12=-5/12=-5.5/12.5=-25/60
Câu 2:
17/34=1/2; -12/22=-6/11; -25/35=-5/7; 125/75=5/3
Câu 3:
MSC=24
1/3=1.8/3.8=8/24 -3/8=-3.3/8.3=-9/24 17/24=17/24
125:1123-35:(110+23)-60
=125:1123-35:133-60
=0,11308993-0,263157894-60
=-0,152258594
=-60,152258594
a) (-98) + (-170)
= - (98 + 170)
= -268
b) 33 . (-21 ) - [(-21) . 7]
= (-21) . [33 - 7]
= (-21) . 26
= -546
c) (-235) + (-235) + (-240) + 475
= (-470) + (-240) + 475
= (-710) + 475
= -235
d) (-2) . [ 19 + (-87)]
= (-2) . (-68)
= 136
e) (-26) . 35 + 35 . (-74) + 110
= 35 . [(-26) + (-74)] + 110
= 35 . (-100) + 110
= (-3500) + 110
= -3390
f) (-97) + 35 + 97
= [(-97) + 97] + 35
= 0 + 35
= 35
g) (-125) + 431
= 306
h) 21 . (-9) + (-5) . (-31)
= (-189) + 155
= -34
i) (-523) + 310
= -213
j) -(-23) - 57
= 23 - 57
= -34
ukm cảm ơn bn đúng hay sao mk cx chưa bít nhưng cx tick cho bn
(35-17)+(17+20-35)
=35-17+17+20-35
=(35-35)+(-17+17)+20
=0+0+20
=20
167.(-34) + 37.264
= - 5678 + 9768
= 4090
17.(-35) - 23.35 - 46.(-35)
= -35.(17 + 23 - 46)
= -35. (40 - 46)
= - 35. (-6)
= 210
87.(-125) - 125.(-97)
= -125.(87 - 97)
= - 125. (-10)
= 1250