65x75+65x10+15x65
15x65+45-63x9
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35x34+35x34+65x75+65x45 tính = cách hợp lí
35x34+35x34+65x75+65x45
= (35 x 34 + 35 x 34) + (65 x 75 + 65 x 45)
= 35 x 34 x 2 + 65 x (75 + 45)
= 2380 + 65 x 120
= 2380 + 7800
= 10180
35x34+35x34+65x75+65x45
= (35 x 34 + 35 x 34) + (65 x 75 + 65 x 45)
= 35 x 34 x 2 + 65 x (75 + 45)
= 2380 + 65 x 120
= 2380 + 7800
= 10180
tính bằng cách thuận tiện;
35x30+35x35+65x75+65x90
35x(30+35)+65x(75+90)
=35x65+65x165
=65x(35+165)
=65x200
=13000
1. Tính nhanh
a. 34x35 + 86x35 + 65x75 + 65x45
b. 75x9998
a) 34 x 35 + 86 x 35 + 65 x 75 + 65 x 45
= ( 34 + 86 ) x 35 + 65 x ( 75 + 45 )
= 120 x 35 + 65 x 120
= 120 x ( 65 + 35 )
= 120 x 100
= 12000
b) ............
a, 34x35+86x35+65x75+65x45
=35x(34+86)+65x(75+45)
=35x120+65x120
=120x(35+65)
=120x100
=12000
a=(34+86)x35+(45+75)x65
=120x35+120x65
=(35+65)x120
=100x120
=12 000
b=749 850
Tính Nhanh
a, 35x34+35x86+65x75+65x45
b, 3x25x8+4x6x37+2x.8.12
a, 35.(34+86) +65.(75+45)= 35. 120 +65.120= 120.(35+65)=120.100=12000
a, 35x34+35x86+65x75+65x45
=35x(34+86)+65x(75+45)
=35x120+65x120
=120x(35+65)
=120x100
=12000
b,3x25x8+4x6x37+2x8x12
=24x25+24x37+24x8
=24x(25+37+8)
=24x70
=1680
35 x 34 + 35 x 86 + 65 x 75 + 65 x 45
= 35 x ( 34 + 86 ) + 65 x ( 65 + 45 )
= 35 x 120 + 65 x 120
= 120 x ( 35 + 65 )
= 120 x 100 = 12000
Tính hợp lý
a.(286:11+7x2)x3-13
b.35x34+65x75+35x38+65x45
a. (286 : 11 +7 x 2) x 3 - 13
= (26 + 14) x 3 - 13
= 40 x 3 - 13
= 120 - 13
= 107
b. 35 x 34 + 65 x 75 + 35 x 38 + 65 x 45
= (35 x 34) + (65 x 75) + (35 x 38) + (65 x 45)
= 1190 + 4875 + 1330 + 2925
= (1190 + 1330) + (4875 + 2925)
= 2520 + 7800
= 10 320
5x25=....................?
4x25=.....................?
42x5=.....................?
8x5=.......................?
4x5=.......................?
___________________________________________________________________________________________________________________
4x100=..............................?
65x10=...............................?
80x100=............................?
45x1000=............................?
___________________________________________________________________________________________________________________
5 x 25 = 125
4 x 25 = 100
42 x 5 = 210
8 x 5 = 40
4 x 5 = 20
4 x 100 = 400
65 x 10 = 650
80 x 100 = 8000
45 x 1000 = 45000
1 tính nhanh
a,35x34+35x86+65x75+65x45
b,3x25x8+4x37x6+2x38x12
c,12x53+53x172-53x84
a,35x34+35x86+65x75+65x45
=35x(34+86)+65x(75+45)
=35x120+65x120
=120x(35+65)
=120x100
=12000
b,3x25x8+4x37x6+2x38x12
=(3x8)x25+(4x6)x37+(2x12)x38
=24x25+24x37+24x38
=24x(25+37+38)
=24x(62+38)
=24x100
=2400
c,12x53+53x172-53x84
=53x(12+172-84)
=53x(184-84)
=53x100
=5300
a.35x(34+86)+65x(75+45)=35x120+65x120=120x(35+65)=120x100=12000
b.3x25x8+4x37x6x2x38x12=24x25+24x37+24x38=24x(25+37+38)=24x100=2400
c.53x(12+172-84)=53x100=5300
a) 35x34+35x86+65x75+65x45
=35.(34+86)+65.(75+45)
=35.120+65.120
=120.(35+65)
=120.100
=12 000
b) 3x25x8+4x37x6+2x38x12
=75.8+148.6+76.12
= 600+888 +912
=2400
c)12x53+53x172-53x84
=53.(12+172-84)
=53.100
=5300
Học Tốt ! #Moon#
tính nhanh
a 2016+(20000-2016)
b 2034+1547-(1547+34)
c 56x101
d 83x11
e 65x12+65x80-65x2+65x10
bỏ dấu
a) 2016+ 20000-2016=2016+(-2016) +20000=0+20000=20000
b) 2034 +1547 - 1547-34=2034-34=2000
c) 56x101=5656
d) 83x11=913
e) 65x(12+80-2=10)=65x100=6500
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