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\(\frac{3}{18}+\frac{1}{18}=\frac{4}{18}=\frac{2}{9}\)hình tròn
Ta chọn phương án A
\(A=\left(\frac{2.18-1}{18}\right)\left(\frac{2.18-2}{18}\right)\left(\frac{2.18-3}{18}\right)....\left(\frac{2.18-35}{18}\right)\left(\frac{2.18-36}{18}\right)\left(\frac{2.18-37}{18}\right)...\left(\frac{2.18-100}{18}\right)\)
\(=\frac{35}{18}.\frac{34}{18}.\frac{33}{18}...\frac{1}{18}.\frac{0}{18}.\frac{-1}{18}...\frac{-64}{18}=0\)
a, ( -18 + 25 ) - ( 125 - 18 + 25 )
= -18+25-125+18-25
= (-18+18) +(25-25) -125
= 0+0-125
= -125
b, 45 . ( 18 - 15 ) -18 . ( 45 + 45 )
= 45.18 - 45.15 -18.45 +18.45
= 45(18-15-18+18)
= 45.3=135
a ) = -18 + 25 - 125 + 18 - 25
= (-18 + 18 ) - ( 25 -25 ) + 125
= 0 - 0 + 125
=125
\(-18.2+18.\left(-6\right)+\left(-18\right).3\)
\(=-18.2+\left(-18\right).6+\left(-18\right).3\)
\(=-18.\left(2+6+3\right)\)
\(=-18.11\)
\(=-198\)
a, ( -18 + 25 ) - ( 125 - 18 + 25 )
= -18 + 25 + 125 + 18 - 25
= [(-18) + 18] + (25 - 25) + 125
= 0 + 0 + 125
= 125
b, 45 . ( 18 - 15 ) - 18 . ( 45 + 45 )
= 45 . 18 - 45 . 15 - 18 . 45 - 18 . 45
= (45 . 18 - 18 . 45) - (45 . 15 - 18 . 45)
= 0 - 45 . (15 - 18)
= 0 - 45 . -3
= 0 - (-135)
= 135
Đặt A=18 * 32 + 43 * 18 + 18 * 26 - 18
=18*(32+43+26-1)
=18*100
=1800
Đặt B=1 + 4 + 7 + 10 + .......+ 94 + 97 + 100
Tổng B có số số hạng là:
(100-1):3+1=34 (số)
tổng B là:
(100+1)*34:2=1717
Thay vào ta có \(\frac{A}{B}=\frac{1800}{1717}\)
=[18.(32+43+26-1)]:(1+4+7+10+...+94+97+100)
=[18.100]:[(100-1):3+1]
=1800:[(1+100).34:2]
=1800:1717
=1800/1717
18
\(\frac{18}{2.5}+\frac{18}{5.8}+....+\frac{18}{103.106}\)
=\(6\left(\frac{3}{2.5}+\frac{3}{5.8}+....+\frac{3}{103.106}\right)\)
=\(6\left(\frac{1}{2}-\frac{1}{5}+\frac{1}{5}-\frac{1}{8}+....+\frac{1}{103}-\frac{1}{106}\right)\)
=\(6\left(\frac{1}{2}-\frac{1}{106}\right)\)
=\(6.\frac{26}{53}\)
=\(\frac{156}{53}\)
=6.3/2.5 +6.3/5.8+...+6.3/203.206
=6(3/2.5+3/5.8+...+3/203.206)
=6(1/2-1/5+1/5-1/8+...+1/203-1/206)
=6[(1/2-1/206)+(1/5-1/5)+(1/8-1/8)+...+(1/203-1/203)]
=6(1/2-1/206)=6(103/206-1/206)=6. 102/206=6. 51/103=306/103
A=6.( 3/2.5+3/5.8+...+3/203.206)
=6.(1/2-1/5+1/3-1/8+...+1/202-1/206)
=6.(1/2-1/206)=306/103
= 5^18.(18-8) : 5^17
= 5^18 . 10 : 5^17
= (5^18:5^17) . 10 = 5 . 10 = 50
k mk nha
-36
\(\left(-18\right)-18\)
\(=\left(-18\right)+\left(-18\right)\)
\(=\left(-36\right)\)