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\(\left(27+55\right)+\left(345-27-55\right)\)
\(=27+55+345-27-55\)
\(=\left(27-27\right)+\left(55-55\right)+345\)
\(=0+0+345\)
\(=345\)
\(38.65+38.50-38.15\)
\(=38.\left(65+50-15\right)\)
\(=38.100\)
\(=3800\)
\(\left(123-60\right)-\left(2017-60+123\right)\)
\(=123-60-2017+60-123\)
\(=\left(123-123\right)-\left(60-60\right)-2017\)
\(=0-0-2017\)
\(=-2017\)
Bỏ dấu ngoặc rồi tính:
(27 + 55 ) + ( 345 - 27 - 55 )
= 27 + 55 + 345 - 27 - 55
= (27-27) + (55-55) + 345
= 0 + 0 + 345
= 345
Tính nhanh:
38.65 + 38.50 - 38.15
= 38.(65+50-15)
= 38.100
= 3800
Bỏ ngoặc rồi tính:
( 123 - 60 ) - ( 2017 - 60 + 123 )
= 123 - 60 - 2017 + 60 - 123
= (123-123) + (60-60) - 2017
= 0 + 0 - 2017
= 0 - 2017
= -2017
b) 35 x 24 + 35 x 76 +55 x 19 +55 x 91
= 35 x ( 24 + 76 ) + 55 x ( 19 + 91 )
= 35 x100 +55 x 100
= 100 x ( 55 + 35 )
= 90 x 100 =9 000
c) \(6\cdot25\cdot4+4\cdot19\cdot6-2\cdot14\cdot12\)
\(=24\cdot25+24\cdot19-24\cdot14\)
\(=24\left(25+19-14\right)\)
\(=24\cdot30=720\)
d) \(19\cdot64+76\cdot34\)
\(=76\cdot19+76\cdot34\)
\(=76\left(19+34\right)=76\cdot53=4028\)
a) 2 x 16 x 50 x 25
= ( 2 x 50 ) x ( 16 x 25 )
= 100 x 400
= 40 000
Bỏ dấu ngoặc rồi tính:
a) (123 - 27)+ (27+ 13-123) -= 123 - 27 + 27 + 13 - 123 = 13
b) (175 + 25 + 13)-(-15 + 175 + 25) = 175 + 25 + 13 + 15 - 175 - 25 = 28
c) (2012 - 119 + 29) - (-119 + 29) = 2012 - 119 + 29 + 119 - 29 = 20122
d) -(55 - 80 + 91) - (2012 + 80 - 91) = - 55 + 80 - 91 - 2012 - 80 + 91 = - 2067
e) 123 + [54 + (-123) + 46] = 123 + 54 - 123 + 46 = 100
f) - 64 + [(-110 + 64 + 71] = -64 -110 +64 + 71 = -39
31.(-18)+31.(-81)-31
= 31.[(-18)+(-81)]
= 31.(-100)
= -3100
135.(171-123)-171.(135-123)
=(135.171-135.123)-(171.135-171.123)
=135.171-135.123-171.135+171.123
=(135.171-171.135)-(135.123-171.123)
=0-123.(135-171)
=0-(-4428)=4428
K)-(-2009+97)-74.(-18)+74.(-118)-2009-3
=2009-97-74.(-18)+74.(-118)-2009-3
=2009-97-74.[(-18)+118]-2009-3
=(2009-2009)-74.100-(97+3)
=0-7400-100
=-7400-100=-7500
Mik bổ sung thêm nha
a,(38-129+43)-(43+38)=38-129+43-43-38=(38-38)+(43-43)-129=-129
b,-144-[29-(+144)-(-144)=-144-29+144-144=(144-144)-29-144=-173
c)48+|48-174|+(-74)=18+126-74=70
d)(-123+77)-(277-23-123)=-123+77-277+23+123=(-123+123)+(77-277)+23=-200+23=-177
e)-(-57-159)+(43-169)=57+129+43-169=(57+43)+(129-169)=100-40=60
Chúc bạn học tốt( sai chỗ nào cho mjk sr nka??) k cho mjk nka
1) 18+14+16+35+110+160+150+145+158+140+55+25
= (14+16)+(35+25)+(145+55)+(140+160)+(158+18)+(110+150)
= 30+ 60 +200+ 300+ 176+ 260
= 590+ 436= 1026.
2) 62+ 78 +48+ 96+85+ 91
= (62 +48)+ (96 +85 +91+ 78)
= 110 + 350= 460.
3) 107 +439 + 666 +673+ 358 + 187
= (107 + 673) + ( 439 + 666) + ( 358+ 187)
= 780 + (1105 + 545)
= 780+ 1650= 2430.
4) 187 + 62+ 78+48+ 96+ 85+ 91+107+ 439+ 666+ 673+ 358
= (187 + 673) + ( 62+ 78)+ (439+ 91)+ ( 85+ 358+ 107)+ (666+ 96+ 48)
= (860+ 140)+ (530+ 550+ 810)
= 1000+ 1890= 2890.
123+55.48-110.24
=178.48-110.24
=68.24
tiick cho mình nha