Tính nhanh
125.13-125+125.188 b) 526+892
c) 4.15.36+12.5.25+10.39.6 d) 3.25.8+4.37.6+2.38.12
e) 1+5+9+....+435+439 f) 25.98
g) 49634- 2997 h) 2400:(50.24)
i)(3600.180): 36 j) 37.7+80.3+43.7
Tính nhanh:
a) 23.56 + 56.77;
b) 32.19 + 32;
c) 35.34 + 35,86 + 65.75 + 65.45;
d) 43.17 + 29.57 + 13.43 + 57;
e) 3.25.8+4.37.6 + 2.38.12
f) 64.16+81.84+17.16
a) 23.56 + 56.77 = (23 + 77).56 = 100.56 = 5600.
b) 32.19 + 32 = 32.(19 +1) = 32.20 = 640.
c) 35.34 + 35.86 + 65.75 + 65.45 = 35.(34 + 86) + 65.(75 + 45)
= 120.35+120.65 -120.(35 + 65) = 12000.
d) 43.17 + 29.57 +13.43 + 57 = 43.(17 +13) + 57.(29 +1)
= 43.30 + 57.30 = 30. (43+57) = 3000.
e) 3.25.8 + 4.37.6 + 2.3812 - 24.25 + 24.37 + 24.38
= 24.(25 + 37 + 38) = 2400.
f) 64.16 + 81.84+17.16 = 16.(64+17)+81.84 = 16.81+81.84
= 81.(16 + 84) = 8100
Tính nhanh:
a) 23.56 + 56.77;
b) 32.19 + 32;
c) 35.34 + 35,86 + 65.75 + 65.45;
d) 43.17 + 29.57 + 13.43 + 57;
e) 3.25.8+4.37.6 + 2.38.12
f) 64.16+81.84+17.16
a) 23.56 + 56.77 = (23 + 77).56 = 100.56 = 5600.
b) 32.19 + 32 = 32.(19 +1) = 32.20 = 640.
c) 35.34 + 35.86 + 65.75 + 65.45 = 35.(34 + 86) + 65.(75 + 45)
= 120.35+120.65 -120.(35 + 65) = 12000.
d) 43.17 + 29.57 +13.43 + 57 = 43.(17 +13) + 57.(29 +1)
= 43.30 + 57.30 = 30. (43+57) = 3000.
e) 3.25.8 + 4.37.6 + 2.3812 - 24.25 + 24.37 + 24.38
= 24.(25 + 37 + 38) = 2400.
f) 64.16 + 81.84+17.16 = 16.(64+17)+81.84 = 16.81+81.84
= 81.(16 + 84) = 8100
a) 185 + 434+ 515 + 266 + 155
b) 652 + 327 + 148 + 15 + 73
c) 5 . 125 . 2 . 1 . 8
d) 8.12.125.2
e) 3.25.8.+4.37.6+2.38.12
a) 185+434+515+266+155 = (185+515)+(434+266)+155
= 700+700+155 = 1555
b. (652+148)+(327+73)+15=800+400+15=1215
c. (125*8)*(5*2)*1=1000*10*1=10000
d. (125*8)*(12*2)=1000*24=24000
e.3*25*4*2+4*37*6+2*38*12=600+888+912=2400
mik ik mik til lại cko nha! mấy bạn
a) 185 + 434+ 515 + 266 + 155
=(185+515)+(434+266)+155
=700+700+155
=1400+155
=1555
b) 652 + 327 + 148 + 15 + 73
=(652+147)+(327+73)+15
=800+400+15
=1215
c) 5 . 125 . 2 . 1 . 8
=10.1000
=10000
d) 8.12.125.2
=24.1000
=24000
e) 3.25.8.+4.37.6+2.38.12
=24.(25+37+38)
=24.100
=2400
Tính nhanh: 3.25.8+4.37.6 + 2.38.12.
3.25.8 + 4.37.6 + 2.3812 - 24.25 + 24.37 + 24.38
= 24.(25 + 37 + 38) = 2400
a) 274+(158+26) b) 29+132+237+868+163 c) 98.31+62 d) 10+11+12+13+...+99 f) (1+3+5+7+... + 217) (135135.137 - 135.137137 e) 3.25.8+4.37.6+2.38.12
a: =274+184=458
b: =29+132+868+237+163
=1000+400+29
=1429
f: =A*135*137(1001-1001)=0
e: =24*25+24*37+24*38
=24*100=2400
c: =31(98+2)=31*100=3100
tính nhanh :
a, 23,56 + 56,77
b, 32,19 + 32
c, 35,34 + 35,86 + 65,75 + 65,45
d, 43,17 + 29,57 + 13,43 + 57
e, 3.25.8 + 4.37.6 + 2.38.12
f, 64,16 + 81,84 + 17,16
a, 23,56 + 56,77=80.3
b, 32,19 + 32 =64.2
c, 35,34 + 35,86 + 65,75 + 65,45=202.4
d, 43,17 + 29,57 + 13,43 + 57 =143.2
e, 3.25.8 + 4.37.6 + 2.38.12=2400
f, 64,16 + 81,84 + 17,16=163.2
Trả lời :
23,56 + 56,77
= 80,3
Hc tốt
Tính nhanh:
3.25.8+4.37.6+2.38.12
3*25*8+4*37*6+2*38*12=24*25+24*37+24*38=24*(25+37+38)=24*100=2400
3.25.8+4.6.37+2.38.12
<=> 24.25+24.37+24.38
<=> 24.(25+37+38)
<=> 24.100
<=> 2400
3 . 25 .8 + 4 .37 .6 + 2. 38 . 12 = 24 .25 + 24. 37 + 24 . 3 = 24 . ( 25 + 37 +38 ) = 24 . 100 = 2400
Tính nhanh:
a) 246+58+54+242
b)11+12+13+....+17+18+19
c)64.16+81.84+17.16
d)3.25.8+4.37.6+2.38.12
Tính nhanh
29+132+237+868+736
3.25.8+4.37.6+2.38.12
Biết làm câu b
=24.25+24.37+24.38
=24.(25+24+38)
=24.87
=2088
cau a là
29 + 135 + 234 + 865 + 766
=(135 + 865) + ( 234 + 766) + 29
= 1000 + 1000 + 29
= 2000 + 29
= 2029
câu b
3.25.8 + 4.37.6 + 2.38.12
= 3.8.25 + 4.6.37 + 2.12.38
=24.25 + 24.37 + 24.38
=24.(25+27+38)
=24.87
=2088
a=2029
b=2088
k cho mình nha chúc bạn học tốt