d:=145-37-55-263
=90-300
=-210
d:=145-37-55-263
=90-300
=-210
65-(35:x+3).19=13
Bài 2: Tính nhanh
a) (35-815)-(795-65)
b) 5-197-2015-2015
c) 1259-1409-12+1259+1409
d) -5+(-37)-45+151-37+151
e) 53-145-359-53+145-259
1
a)34×35+35×86+65×75+65×45
b)652+327+148+15+73
c)341×67+341×16+659×83
d)13+15+17+...+199
2
a)32×(x-10)=64
b)461-(x-45)=387
c)(2×x+15)+342=1517
65 . 37 + 37. 35 + 45 . 63 + 63 . 55
tính nhanh
19/64+76/34
35/12+65/13
1: 136 X 68 + 16 X 272
2: 35 X12 + 65 -13
3: 19 X 64 + 76 X 34
Tính hợp lí
A.35 x 34 + 35 x 38 + 65 x 75 + 65 x 45
B. 12x 53 + 53 x 172 - 53 x 84
C. 35 x 28 + 36 x 82 + 64 x 69 + 64 x 41
D. A = 1+2+3+...+100
E. B =17+19+...+101+103
G. D= 3x (12+13+14+15) + 3x(8+7+6+5)
Tính nhanh:
a. - 55 . 75 + 13 (-75) . (-32)
b. 35. (65 - 24) - 65 (24 + 35)
1964+ 7634
3512+ 6513