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1) 167 + ( -252 ) + 52 + ( -67 )
= 167 + 52 + ( -252 ) + ( - 67 )
= 219 + - ( 252 + 67 )
= 219 + - ( 319 )
= -100
2) ( -215 ) + ( - 115 ) + ( - 80 )
= - ( 215 + 115 ) + ( - 80 )
= - 330 + ( - 80 )
= - ( 330 - 80 )
= - 250
3) 118 + 107 - ( 118 - 93 )
= 118 + ( 107 - 93 )
= 118 + 14
= 132
4) 1 + 5 + 9 + ..... + 97 + 101
= ( 101 : 1) - 4 = 96
= 101 x 96
= 9696
5) 38 - 138 + 250 - 350
= - 100 + - 100
= 0
6) - ( - 357 ) + ( - 27 ) + ( - 32 )
= - ( - 357 ) + - ( 27 + 32 )
= - ( - 357 ) + - 59
= - ( 357 + 59 )
= - 416
7) 40 + ( 139 - 172 + 99 ) - ( 139 + 199 - 172 )
= 40 + ( 100 - 100 )
= 40 + 0
= 40
8) ( -1 ) + 2 + ( - 3 ) + 4 + ( - 99 ) + 100
a, 4567 + ( 1234 - 4567 ) - 4
= 4567 + 1234 - 4567 - 4
=(4567 - 4567) + (1234 - 4)
= 0 + 1230
=1230
b, 2001 - ( 53 + 1579 ) - ( - 53 )
= 2001 - 53 - 1579 + 53
=(2001-1579) - (53 - 53)
= 422 - 0
= 422
c, 79.89 - 79 . ( - 11 ) - 100.79
= 79.(89 + 11 - 100)
= 79.0
= 0
d, 11.107 + 11.18 - 25.11
= 11.(107 + 18 - 25)
= 11. 100
= 1100
e, -69 .|- 45 | -31 . | 45 |
= -69.45 - 31.45
= 45.(-69 - 31)
= 45.(-100)
= -4500
f, 17 . ( 15 - 16 ) + 16
= 17.(15 - 16) + 17 - 1
= 17.(15 - 16 + 1) - 1
= 17.0 - 1
= -1
g, 37.24 + 37.76 + 63.79 + 21.63
= 37.(24 + 76) + 63.(79 + 21)
= 37.100 + 63.100
= 100.(37 + 63)
= 100.100
= 10000
h, 167 + ( - 252 ) + 52 + (- 67 )
= (167 - 67) - (252 - 52)
= 100 - 200
= -100
i, 118 + 107 - (- 118 - 93 ) - 58
= 118 + 107 + 118 + 93 - 58
= (118 + 118 - 58) + (107 + 93)
= 178 + 100
= 278
k, 38 - 138 + 250 - 350
= (38 - 138) + (250 - 350)
= -100 + (-100)
= -200
l, ( 139 - 172 + 99 ) - ( 139 + 199 - 172 )
= 139 - 172 +99 - 139 - 199 + 172
= (139 - 139) - (172 - 172) + (99 - 199)
= 0 - 0 + (-100)
= -100
m, mình không biết nhé :))) thông cảm
sửa lại câu i:
= 118 + 107 + 108 + 93 - 58
= (118 + 118 - 58) + (107 + 93)
= 178 + 200
= 378
a) 37.24+37.76+63.79+21.63
= 37(24+76)+63(79+21)
= 37.100+63.100
= (37+63)100
= 100.100
= 10000
b) 101+(-60)+29+(-40)
= (101+29)+(-60-40)
= 130-100
= 30
c) 40+(139-172+99)-(139+199-127)
= 40+139-172+99-139-199+127
= (139-139)+(-127+127)+(99-199)+40
= 0+0-100+40
= -60
d) (158.129-158.39):180
= [158(129-39)]:180
= (150.90):180
= 75
=
40 + ( 139 - 172 + 99 ) - ( 139 + 199 - 127 )
= 40 + 139 + 172 + 99 - 139 - 199 +127
= ( 139 - 139 ) + ( 99 - 199 ) + ( 127 - 172 + 40 )
= 0 -100 - 5
= -105
\(g,101+\left(-60\right)+29+\left(-40\right)=41+29+\left(-40\right)=70+\left(-40\right)=30\)
\(h,167+\left(-252\right)+52+\left(-67\right)=\left(-85\right)+52+\left(-67\right)=\left(-33\right)+\left(-67\right)=-100\)
\(i,38-138+250-350=\left(-100\right)+250-350=150-350=-200\)
\(k,118+107-\left(118-93\right)-50=225-25-50=100-50=50\)
\(m,40+\left(139-172+99\right)-\left(139+199-172\right)=40+\left[\left(-33\right)+99\right]-\left(338-172\right)\)
\(=40+66-166=106-166=-60\)