A = 1/3 - 3/4 + 3/5 + 1/72 -2/9 - 1/36 + 1/15
A = (1/3 + 3/5 +1/15 ) - ( 3/4 + 2/9 +1/36 ) +1/72
A = 1 - 1 +1/ 72 = 1/72
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Tính hợp lý
1/3 + -3/4 + 3/5 + 1/64 + - 2/9 + -1/36 + 1/15
Bài 5 Tính nhanh
B = 1/3 - 3/4 - ( -3/5 ) + 1/64 - 2/9 - 1/36 + 1/15
tính : 1/3-3/4-(-3/5) + 1/64-1/9-1/36+1/15
Tính nhanh: 1/3 - 3/4 + 3/5 + 1/64 - 2/9 - 1/36 + 1/15. Mình cần gấp nhé cảm ơn
Tính hợp lí nếu có thể:
a)3/7+4/9+4/7+5/9
b)1/5+4/10+9/15+16/20+25/25+36/30+49/35+64/40+81/45
c)1/8+1/12+3/8+5/12
d)(1-1/2)x(1-1/3)x(1-1/4)x...x(1-100)
e)9/5:17/15+8/5:17/15
f)2/1x2+2/2x3+2/3x4+...+2/19x20
Ai nhanh nhất mình tick cho
Tính bằng cách hợp lí
A=\(\frac{1}{3}-\frac{3}{4}-\left(-\frac{3}{5}\right)+\frac{1}{64}-\frac{2}{9}-\frac{1}{36}+\frac{1}{15}\)
1)Tính:
a) A=1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90
b) B=(3/4)(8/9)(15/16)(24/25)(35/36)(48/49)(63/64)
c) C=1/4+1/12+1/36+1/108+1/324+1/92
(5/7-7/7)-[0,2-(-2/7-1/10]
(3-1/4+2/3)-(5-1/3-5/6)-(6-7/4+-3/2)
1/3-3/4--3/5+1/64-2/9-1/3+1/15
3/5:(1/15-1/6)+3/5:(-1/3-16/15)
1/2(-3/4-13/14):5/7-(-2/21+1/7):7/7
-2/9+-3/4+3/5+1/15+1/57+1/3+-1/36