1. Tính nhanh
a) 58.75+58.50-58.25 e)48.19+48.114+134.52
b) 128.35+128.32+ 128.22. f) 27.121-87.27+73.34
c) 12.35+53.182-35.94 g) 125.98-125.46-52.25
a) 29.75.2 +58.50 - 58.25
b)9.39.3 + 27.63 - 2.27
c) 64.46.2 + 16.32.8 + 128.22
d) 6.25.11 + 5.22.3 + 66.14 + 33.66
e) 12.35 + 35.182 - 35.94
f) 48.19 + 48.115 + 134. 52
g) 27.121 - 87.27 + 73.34
h) 125.98 - 125.46 - 52.25
a, 5800
b, 2700
c, 12800
d, 5082
e, 10080
f, 13400
g, 5020
h, 5200
a) 29.75.2+58.50-58.25 b) 9.39.3+27.63-2.27
= (29.2).75+58.50-58.25 = (9.3).39+27.63-2.27
= 58.75+58.50-58.25 = 27.39+27.63-2.27
= 58.(75+50-25) = 27.(39+63-2)
= 58.100 = 27.100
= 5800. = 2700.
c)64.46.2+16.32.8+128.22 d)6.25.11+5.22.3+66.14+33.66
= (64.2).46+(16.8).32+128.22 = (6.11).25+5.(22.3)+66.14+33.66
= 128.46+128.32+128.22 = 66.25+5.66+66.14+33.66
= 128.(46+32+22) = 66.(25+5+14+33)
= 128.100 = 66.77
= 12800. = 5082
a) 29 . 75 . 2 + 58 . 50 - 58 . 25
= (29 . 2) . 75 + 58 . 50 - 58 . 25
= 58 . 75 + 58 . 50 - 58 . 25
= 58 . (75 + 50 - 25)
= 58 . (125 - 25)
= 58 . 100
= 5800
b) 9 . 39 . 3 + 27 . 63 - 2 . 27
= (9 . 3) . 39 + 27 . 63 - 2 . 27
= 27 . 39 + 27 . 63 - 2 . 27
= 27 . (39 + 63 - 2)
= 27 . (102 - 2)
= 27 . 100
= 2700
c) 64 . 46 . 2 + 16 . 32 . 8 + 128 . 22
= (64 . 2) . 46 + (16 . 8) . 32 + 128 . 22
= 128 . 46 + 128 . 32 + 128 . 22
= 128 . (46 + 32 + 22)
= 128 . (78 + 22)
= 128 . 100
= 12800
d) 6 . 25 . 11 + 5 . 22 . 3 + 66 . 14 + 33 . 66
= (6 . 11) . 25 + 5 . (22 . 3) + 66 . 14 + 33 .66
= 66 . 25 + 5 . 66 + 66 . 14 + 33 .66
= 66 . (25 + 5 + 14 + 33)
= 66 . (30 + 14 + 33)
= 66 . (44 + 33)
= 66 . 77
= 5082
e) 12 . 35 + 35 . 182 - 35 . 94
= 35 . (12 + 128 - 94)
= 35 . (140 - 94)
= 35 . 46
= 1610
f) 48 . 19 + 48 . 115 + 134 . 52
= 48 . (19 + 115) + 134 . 52
= 48 . 134 + 134 . 52
= 134 . (48 + 52)
= 134 . 100
= 13400
g) 27 . 121 - 87 . 27 + 73 . 34
= 27 . (121 - 87) + 73 . 34
= 27 . 34 + 73 . 34
= (27 + 73) . 34
= 100 . 34
= 3400
h) 125 . 98 - 125 . 46 - 52 . 25
= 125 . (98 - 46) - 52 . 25
= 125 . 52 - 52 . 25
= (125 - 25) . 52
= 100 . 52
= 5200
Tính nhanh:
A) 58.75+58.50-58.25
B) 27.39+27.63-2.27
C) 128.46+128.32+128.22
D) 12.35+35.182-35.94
E) 48.19+48.115+134.52
F) 136.23+136.17-40.36
G) 17.93+116.83+17.23
H) 19.27+47.81+19.20
I) 87.23+13.93+70.87
Áp dụng công thức này là được :
m.a+m.b+m.c = m(a+b+c)
a) 58.75 + 58.50 - 58.25
= 58. (75 + 50 - 25)
= 58. 100
= 5800
b) 27.39 + 27.63 + 2.27
= 27. (39 + 63 - 2)
= 27. 100
= 2700
c) 128.46 + 128.32 + 128.22
= 128.(46 + 32 + 22)
= 128. 100
= 12800
d) 12.35 + 35.182 - 35.94
= 35.(12 + 182 - 94)
= 35. 100
= 3500
e) 48.19 + 48.115 + 134.52
= 48.(19 + 115) + 134.52
= 48.134 + 134.52
= 134.(48 + 52)
= 134.100
= 13400
f) 136.23 + 136.17 - 40.36
= 136.(23 + 17) - 40.36
= 136.40 - 40.36
= 40.(136 - 36)
= 40.100
= 4000
g) 17.93 + 116.83 + 17.23
= 17.(93 + 23) + 116.83
= 17.116 + 116.83
= 116.(17 + 83)
= 116.100
= 11600
h) 19.27 + 47.81 + 19.20
= 19.(27 + 20) + 47.81
= 19.47 + 47.81
= 47.(19 + 81)
= 47.100
= 4700
i) 87.23 + 13.93 + 70.87
= 87.(23 + 70) + 13.93
= 87.93 + 13.93
= 93.(87 + 13)
= 93.100
= 9300
#NgHn
A) 58.75+58.50-58.25
B) 27.39+27.63-2.27
C) 128.46+128.32+128.22
D) 12.35+35.182-35.94
E) 48.19+48.115+134.52
F) 136.23+136.17-40.36
G) 17.93+116.83+17.23
H) 19.27+47.81+19.20
I) 87.23+13.93+70.87
a,
58.75 + 58.50 - 58.25
= 58.(75 + 50 - 25)
= 58. (125 - 25)
= 58.100
= 5800
b, 27.39 + 27.63 - 2.27
= 27.(39 + 63 - 2)
= 27.(102 - 2)
= 27.100
= 2700
c, 128.46 + 128.32 + 128.22
= 128.(46 + 32 + 22)
= 128.(78 + 22)
= 128.100
= 12800
A 48.19 48.115 134.52B 27.121 87.27 73.34C 125.98 125.46 52.25D 136.23 136.17 40.36E 17.93 116.83 17.23F 35.23 35.41 64.65Giải hộ mk nha , mk đang vội w Chú ý Dấu chấm là dấu nhân nha v
25. 71 .50 . 4 .2
e) 48.19 + 48.115 + 134.52
f) 136.23 + 136.17
–
40.36;
Bài 1: Tính giá trị của biểu thức sau:
a) 2763 + 152 b) (-7) + (-14) c) (-35) + (-9)
d) (-5) + (-248) e) (-23) + 105 f) 78 + (-123)
g) 23 + (-13) h) (-23) + 13 i) 26 + (-6)
k) 19 + (23 – 33) m) (-12 – 44) + (-3) n) 4 – (-15)
o) 99 – [109 + (-9)] p) (-75) + 50
q (-75) + (-50) r) (-23) + 13 + ( - 17) + 57
s) 14 + 6 + (-9) + (-14)
Bài 2: Tính nhanh:
a) 58.75 + 58.50 – 58.25 b) 27.39 + 27.63 – 2.27
c) 128.46 + 128.32 + 128.22 d) 66.25 + 5.66 + 66.14 + 33.66
e) 12.35 + 35.182 – 35.94 g) 27.121 – 87.27 + 73.34
h) 125.98 – 125.46 – 52.25 i) 136.23 + 136.17 – 40.36
Bài 3: Tìm số nguyên x, biết:
a) x - 7 = -5 b) 128 - 3 . ( x+4) = 23
c) [ (6x - 39) : 7 ] . 4 = 12 d)( x: 3 - 4) . 5 = 15
Bài 4: Tìm tổng của tất cả các số nguyên thỏa mãn:
a) -4 < x < 3 b) -5 < x < 5
c) -10 < x < 6 d) -1 ≤ x ≤ 4
e) -6 < x ≤ 4 f) -4 < x < 4
tinh nhanh :
a/ 48.19+48.115+.52
b/ 27.121-87.27+73.34
c/ 125.98-125.46-52.25
bài 1: tính nhanh
a) 48.19+48.115+134.52
b) 27.121-87.27+73.34
c)125.98-125.46-52.25
d) 136.23+136.17-40.36
e) 17.93+116.83+17.23
ê)19.27+47.81+19.20
f) 87.23+13.93+70.87
a) 48.19+48.115+134.52
=48.(19+115)+134.52
=48.134+134.52
=(48+52).134
=100.134
=13400
b) 27.121-87.27+73.34
=27.(121-87)+73.34
=27.34+73.34
=(27+73).34
=100.34
=3400
c)125.98-125.46-52.25
=125.(98-46)-52.25
=125.52-52.25
=(125-25).52
=100.52
=5200
d) 136.23+136.17-40.36
=136.(23+17)-40.36
=136.40-40.36
=(136-36).40
=100.40
=4000
e) 17.93+116.83+17.23
=17.(93+23)+116.83
=17.116+116.83
=(17+83).116
=100.83
=3800
ê)19.27+47.81+19.20
=19.(27+20)+47.81
=19.47+47.81
=(19+81).47
=100.47
=4700
f) 87.23+13.93+70.87
=87.(23+70)+13.93
=87.93+13.93
=(87+13).93
=100.93
=9300
câu e) sai rồi phải là 100.116=11600 mới đúng . Chúc bạn học tốt , yêu bạn nhiều
TÍNH NHANH:
a,48.19+48.115+134.52
b,27.121-87.27+73.34
c,125.98-125.46-52.25
trình bày cách giải hộ mình nhé
a,48.(19+115)+134.52=48.134+134.52=134.(48+52)=134.100=13400
b,27.(121-87)+73.364=27.34+73.34=34.(73+27)=34.100=3400
c,125.(98-46)-52.25=125.52-52.25=25.(125-25)=25.100=2500
tick nha
tính nhanh :
58.75+58.50-58.25
66.25+5.66.66.14+33.66
125.98-125.46-52.25
53.39+43.39-53.21+47.21
58.75 + 58.50 - 58.25
= 58.(75 + 50 - 25)
= 58.100
= 5800