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a) 15, 37 – 12, 37) . 0,12 = 3. 0,12 = 0,36
b ) 6 5 12 : 2 3 4 + 11 1 4 . 1 3 − 1 5 = 77 12 : 11 4 + 45 4 . 2 15 = 77 33 + 3 2 = 23 6 c ) 5 6 : 0,125 − 2 1 4 − 0,6 . 10 11 = 5 6 : 1 8 − 9 4 − 3 5 . 10 11 = 155 11 d ) 1,4. 15 19 − 4 5 + 2 3 : 2 1 5 = 7 5 . 15 19 − 22 15 : 11 5 = 21 19 − 2 3 = 25 57 e ) ( − 1,2 ) . − 3 24 + 0,4 − 1 4 15 : 1 2 3 = − 6 5 . − 3 24 + 2 5 − 19 15 : 5 3 = − 37 100 f ) 1 13 15 .0,75 − 11 20 + 25 % = 28 15 . 3 4 − 11 20 + 1 4 = 3 5
a) − 1 10 + 3 5 + − 1 2 = − 1 10 + 6 10 + − 5 10 = 0
b)
3 8 + − 3 4 + 7 12 : 5 6 + 1 2 = 9 24 + − 18 24 + 14 24 : 5 6 + 1 2 = 5 24 ⋅ 6 5 + 1 2 = 1 4 + 1 2 = 3 4
a)
6 5 12 : 2 3 4 + 11 1 4 1 3 − 1 5 = 77 12 : 11 4 + 45 4 . 2 15 = 7 3 + 3 2 = 23 6
b)
1 13 15 ⋅ 0 , 75 − 11 20 + 25 % : 7 5 = 28 15 ⋅ 3 4 − 11 20 + 1 4 : 7 5 = 7 5 − 4 5 ⋅ 5 7 = 7 5 − 4 7 = 29 35
a) 5 13 + − 5 7 + − 20 41 + 8 13 + − 21 41 = 5 13 + 8 13 + − 20 41 + − 21 41 + − 5 7 = − 5 7
b) 1 28 + − 1 14 + 3 28 + − 1 7 + 3 14 = 1 28 + 3 28 + − 1 14 + 3 14 + − 1 7 = 1 7
c) 1 2 + − 2 3 + 3 4 + − 4 5 + 5 6 + − 5 6 + 4 5 + − 3 4 + 2 3 + − 1 2 = 1 2 + − 1 2 + 3 4 + − 3 4 + − 4 5 + 4 5 + 5 6 + − 5 6 = 0
a) (-37)+14+26+37 = ( -37 + 37) + ( 14 + 26) = 40
b) (-24)+6+10+24 = ( - 24 + 24) + ( 6 + 10) = 16
c) 15+23+9-25)+(-33) = (15 - 25) + ( 23 - 33) + 9
= - 10 - 10 + 9
= - 11
d) 60+33+(-50)+(-33) = ( 60 -50) + ( 33 - 33)
= 10
e) (-16)+(-209)+(-14)+209 = ( - 16 - 14) + ( - 209 + 209)
= - 30
g) (-12)+(-13)+36+(-11)= ( - 11 -12 - 13 ) + 36
= - 36 + 36 = 0
h) -16+24+16-34 = ( - 16 + 16)+(24 - 34) = - 10
r) 25+37-48-25-37 = (25 - 25)+(37 - 37) - 48 = - 48
u) 2575+37-2576-29 = ( 2575 - 2576) + ( 37 - 29)
= - 1 + 8 = 7
i) 34+35+36+37-14-15-16-17 = ( 34 - 14 )+(35 - 15)+(36-16)+ (37 - 17)
= 80
2 . Bỏ ngoặc rồi tính
a)-7264+(1543+7264) = - 7264 + 1543 + 7264
= 1543
b) (144-97)-144 = 144 - 97 - 144 = - 97
c) (-145)-(18-145) = - 145 - 18 + 145 = - 18
d) 11+(-11+27) = 11 - 11 + 27 = 27
e) (27+514)-(486-73) = 27 + 514 - 486 + 73
= 128
g) (36+79)+(145-79-66) = 36 + 79 + 145 - 79 - 66
= 115
h) 10-[12-(-9-1) = 10 - ( 12 + 9 + 1)
= 10 - 22
= - 12
r) (-28-29+43)-(43+38) = - 28 - 29 + 43 - 43 - 38
= - 95
u ) 271 - [(-43)+271-(-17)] = 271 + 43 - 271 - 17 = 26
i ) -144-[29-(+144)-(+144) = - 144 - 29 - 144 + 144 = -173
\(a,\left(38+-34+712\right):56+12\)
\(=\left(4+712\right):56+12\)
\(=716:56+12\)
\(=\frac{179}{14}+12\)
\(=\frac{347}{14}\)
\(b,12+34-\left(34-45\right)\)
\(=12+34--11\)
\(=46--11\)
\(=57\)
\(c,6512:234+1114\cdot\left(13-15\right)\)
\(=6512:234+1114\cdot-2\)
\(=\frac{3256}{117}+-2228\)
\(=\frac{-257420}{117}\)
\(d,\left(78-34\right)\cdot113-27\cdot\left(3,5\right)^2\)
\(=44\cdot113-27\cdot\frac{49}{4}\)
\(=4972-\frac{1323}{4}\)
\(=\frac{18565}{4}\)
\(e,\left(35+0,415-3200\right)\cdot223\cdot0,25\)
\(=-3164,585\cdot223\cdot0,25\)
\(=-176425,6138\)
\(f,516:0,125-\left(214-0,6\right)\cdot1011\)
\(=516:0,125-213,4\cdot1011\)
\(=4128-215747,4\)
\(=-211619,4\)
\(g,0,25:\left(10,3-9,8\right)-34\)
\(=\frac{1}{4}:\frac{1}{2}-34\)
\(=\frac{1}{2}-34\)
\(=\frac{-67}{2}\)
\(h,11315\cdot0,75-\left(1120+25\%\right):73\)
\(=11315\cdot0,75-\frac{4481}{4}:73\)
\(=\frac{33945}{4}-\frac{4481}{292}\)
\(=\frac{618376}{73}\)
\(k,23+27-114-1-37+328\)
\(=50-114-1-37+328\)
\(=-64-1-37+328\)
\(=-65-37+328\)
\(=-102+328\)
\(=226\)
MK CHUC BAN HOC TOT :))