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Đáp án:
a, 38+41+117+159+6238+41+117+159+62
=(38+62)+(41+159)+117=(38+62)+(41+159)+117
=100 +200 +117=100 +200 +117
=417=417
b, 73+86+968+914+303273+86+968+914+3032
=73+(86+914)+(968+3032)=73+(86+914)+(968+3032)
=73+1000 +4000=73+1000 +4000
=5073=5073
c, 341.67+341.16+659.83341.67+341.16+659.83
=341.(67+16)+659.83=341.(67+16)+659.83
=341.83+659.83=341.83+659.83
=83.(341+659)=83.(341+659)
=83.1000=83000=83.1000=83000
d, 42.53+47.156−47.11442.53+47.156-47.114
=42.53+47.(156−114)=42.53+47.(156-114)
=42.53 +47.42=42.53 +47.42
=42.(53+47)=42.100=42.(53+47)=42.100
=4200=4200
e, 563.23+23.26+23563.23+23.26+23
=23.(563+26+1)=23.(563+26+1)
=23.600=23.600
=13800=13800
f, 132+157+43+68132+157+43+68
=(132+68)+(157+43)=(132+68)+(157+43)
=200 +200=400=200 +200=400
g, 49.68+100.34+6849.68+100.34+68
=49.68+50.68+68=49.68+50.68+68
=68.(49+50+1)=68.(49+50+1)
=68.100=6800=68.100=6800
h, 491.(267+53)+491.(151+67)491.(267+53)+491.(151+67)
=491.(267+53+151+67)=491.(267+53+151+67)
=491.538=491.538
=264158=264158
Vote mk nha.
là biếng viết lời giải
1062
3700
40340
còn lời giải thích thì hỏi sau
a)997+86=997+3+83=1000+83=1083
b)37.(38+62)=37.100=3700
c)27.332+68.27+73.332+68.78
=27.332+73.332+68.27+68.78
=332.(27+73)+68.(27+78)
=332.100+68.105
=40340
Đáp án là:
a) 36*333-108*111
= 36*3*111-108*111
=108*111-108*111
=0
b) 136*68+16*272
=136*68+16*2*136
=136*68+32*136
=136*(68+32)
=136*100
=13600
a) 36*333 - 108*111
= 36*3*111 - 108*111
= 108*111 - 108*111
= 0
b) 136*68 + 16*272
= 136*68 + 16*2*136
= 136*68 + 32*136
= 136*(68 + 32)
= 136*100
= 13600
a: \(61\cdot45+61\cdot23-68\cdot51\)
\(=61\left(45+23\right)-68\cdot51\)
\(=68\cdot61-68\cdot51\)
\(=68\left(61-51\right)=68\cdot10=680\)
b: \(3\cdot5^2-\left(75-4\cdot2^3\right)\)
\(=75-75+4\cdot8\)
\(=4\cdot8=32\)
c: \(36:\left\{2^2\cdot5-\left[30-\left(5-1\right)^2\right]\right\}\)
\(=\dfrac{36}{20-30+4^2}\)
\(=\dfrac{36}{-10+16}=\dfrac{36}{6}=6\)
d: \(\left(12\cdot49-3\cdot2^2\cdot7^2\right):\left(2020\cdot2021\right)\)
\(=\dfrac{\left(12\cdot49-12\cdot49\right)}{2020\cdot2021}=0\)
Bài 1 : Tính :
\(a)49-\left(-54\right)-23=103-23\)
\(=80\)
\(b)\left(-25\right).68+\left(-34\right).\left(-250\right)=-1700+8500\)
\(=6800\)
\(c)1999+\left(-2000\right)+2001+\left(-2002\right)=\left(-1\right)+\left(-1\right)\)
\(=-2\)
\(d)515+\left[72+\left(-515\right)+\left(-32\right)\right]=515+\left(-475\right)\)
\(=40\)
\(e)\left(2736-75\right)-2736+175=2661-2736+175\)
\(=100\)
\(g)-2020-\left(157-2020\right)-\left(-257\right)=-2020-\left(-1863\right)-\left(-257\right)\)
\(=100\)
a, = 20 .(-4) + 31 . (-20)
= -80 - 620 = -700
b, = -18 . 31 - 28 .(-24)
= -558 + 672 = 114
a )
= 20 x (-4) + 31 x ( -20 )
= ( -20 ) x 4 + 31 x ( - 20 )
= ( - 20 ) x ( 4 + 31 )
= ( - 20 0 x 35
= -700
b)
=-18 x 31 - 28 x -24
=-558 - -672
=(-558) +( 672)
= 114
a) \(-215+\left(-427\right)-\left(-515\right)-573\)
\(=-215+\left(-427\right)+515-573\)
\(=\left(-215+515\right)+\left(-427-573\right)\)
\(=-300+-1000=-1300\)
b) \(-68+68.\left(-76\right)+68.\left(-23\right)\)
\(=68.\left(-1\right)+68.\left(-76\right)+68.\left(-23\right)\)
\(=68.\left(-1+-76+-23\right)\)
\(=68.-10=-6800\)