bài 1: Bỏ ngoặc rồi tính
a) ( 15 + 37 ) + (52 – 37 -17 )
b) (38 – 42 + 14 ) – (25 – 27 – 15)
c) – (21 – 32) – (-12 + 32)
d) -(12 + 21 – 23) – (23 – 21 + 10)
e) (57 – 725) – (605 – 53)
f) (55 + 45 + 15) – (15 – 55 + 45)
g) (35 + 75) + (345 – 35 – 75)
h) (2002 – 79 + 15) – (-79 + 15)
i) – (515 – 80 + 91) – (2003 + 80 – 91)
j) 25 – (-17) + 24 -12
k) 235 – (34 + 135) -100
l) (13+49) – (13 – 135 + 49)
m) ( 18+29 ) + ( 158 – 18 – 29 )
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Đáp án:
ở dưới
Giải thích các bước giải:
$a) ( 15 + 37 ) + (52 – 37 -17 )$
$=15+37+52-37-17$
$=50$
$b) (38 – 42 + 14 ) – (25 – 27 – 15)$
$=38-42+14-25+27+15$
$=27$
$c) – (21 – 32) – (-12 + 32)$
$=-21+32+12-32$
$=-9$
$d) -(12 + 21 – 23) – (23 – 21 + 10)$
$=-12-21+23-23+21-10$
$=-22$
$e) (57 – 725) – (605 – 53)$
$=57-725-605+53$
$=-1220$
$f) (55 + 45 + 15) – (15 – 55 + 45)$
$=55+45+15-15+55-45$
$=110$
$g) (35 + 75) + (345 – 35 – 75)$
$=35+75+345-35-75$
$=345$
$h) (2002 – 79 + 15) – (-79 + 15)$
$=2002-79+15+79-15$
$=2002$
$i) – (515 – 80 + 91) – (2003 + 80 – 91)$
$=-515+80-91-2003-80+91$
$=-2518$
$j) 25 – (-17) + 24 -12$
$=25+17+24-12$
$=54$
$k) 235 – (34 + 135) -100$
$=235-34-135-100$
$=-34$
$l) (13+49) – (13 – 135 + 49)$
$=13+49-13+135-49$
$=135$
$m) ( 18+29 ) + ( 158 – 18 – 29 )$
$=18+29+158-18-29$
$=158$
1.
a)( 15 + 37 ) + (52 – 37 -17 )
=52+(-2)
=50
b)(38 – 42 + 14 ) – (25 – 27 – 15)
=10-(-17)
=27
c)- (21 – 32) – (-12 + 32)
=11-20
=-9
d)-(12 + 21 – 23) – (23 – 21 + 10)
=-10-12
=-22
e) (57 – 725) – (605 – 53)
=-668-552
=-1220
f) (55 + 45 + 15) – (15 – 55 + 45)
=115-5
=110
g) (35 + 75) + (345 – 35 – 75)
=110+235
=345
h) (2002 – 79 + 15) – (-79 + 15)
=1938+64
=2002
i) – (515 – 80 + 91) – (2003 + 80 – 91)
=-526-1992
=-2518
j) 25 – (-17) + 24 -12
=42+12
=54
k) 235 – (34 + 135) -100
=235-169-100
=-34
l) (13+49) – (13 – 135 + 49)
=52+73
=125
m) ( 18+29 ) + ( 158 – 18 – 29 )
=47+111
=158
Xin ctrlhn nhoa