xin dap an: tinh hop li
a(273 - 51 ) - [ 73 - (-149) ]
b130 - [ 13 . 3 -(19- 16)2].
Những câu hỏi liên quan
tinh hop li A = 10+11+12+13+14+15+16+17+18+19
= (11+19) + (12+18) + (13+17) + (14+16) + (10+15)
= 30 + 30 + 30 + 30 + 25 = 145
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A = 10 + (11 + 19) + (12 + 18) + (13 + 17) + (14 + 16) + 15
= 10 + 30 + 30 + 30 + 30 + 15 = 145
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1.tinh hop li
a.2/13/19+8/21-13/19+3,5+13/21
b.11/25.(-24.8)-11/25.75.2
a: \(=2+\dfrac{13}{19}+\dfrac{8}{21}-\dfrac{13}{19}+\dfrac{7}{2}+\dfrac{13}{21}\)
\(=2+\dfrac{7}{2}+1=3+\dfrac{7}{2}=\dfrac{13}{2}\)
b: \(=\dfrac{11}{25}\left(-192-150\right)=\dfrac{11}{25}\cdot\left(-342\right)=-\dfrac{3762}{25}\)
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Thuc hien phep tinh sau bang cach hop li nhat:
a)5/11+1/2+2/5+6/11+3/4+16/25+5/16
b)19/4+37/100+1/8+132/25+5/2+37/12
5/11+1/2+2/5+6/11+3/4+16/25+5/16
=1441/400
19/4+37/100+1/8+132/25+5/2+37/12
=1933/120
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Ban lam sao duooc nhu the giai ra cho minh voi
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tinh hop li:
a) 1+2+3...+20
b)1+3+5+...+21
c)2+5+8+...+2018 +2021
d)1*2+2*3+3*4+...+15*16
e)1*2*3+2*3*4+3*4*5+... +13*14*!5
Thuc hien phep tinh bang cach hop li ( neu co the )
a / 81 + 243 + 19
b / ( 67 + 129 ) + ( 133 - 29 )
c / 75 × 16 + 84 × 75 - 500
d / 4 × 52 - 16 : 23 20200
a / 81+19+243
= 100+243
=343
b/ = 67 +129+133-29
= 67+133+129-29
= 200-100
= 100
c / = 75 x ( 16+84)-500
= 75 x 100-500
= 7500-500
= 7000
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a / 81+19+243
= 100+243
=343
b/ = 67 +129+133-29
= 67+133+129-29
= 200-100
= 100
c / = 75 x ( 16+84)-500
= 75 x 100-500
= 7500-500
= 7000
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de bai tinh gia tri bieu thuc sau mot cach hop li (ghi ro tinh chat da ap dung)
A=6/19 . - 7/11 + 6/19 . -4/11 + -13/19
B=5/7 . -4/13 +5/7 .7/13 - 5/13 . 3/7
lam het mik cho 1 like nha ai dung mik se kb va cho like nha cac ban
bài 1 tinh nhanh
45+55+73+53
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20
đầu bài: 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20
= (1+19)+(2+18)+(3+17)+(4+16)+(5+15)+(6+14)+(7+13)+(8+12)+(9+11)+20
= 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 +20
= 20.10
= 200
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1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20=\(\frac{\left(1+20\right)20}{2}\)=210
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45 + 55 + 73 + 53 = 226
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 = 210
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Xem thêm câu trả lời
Tinh gia tri cua cac bieu thuc sau theo 1 cach hop li
a, A= 1/3 × -6/13 × -9/10 × -13/36
b, B= -1/3 × -15/17 × 34/45
c, C=1/3 × 4/5 + 1/3 × 6/5 + 2/3
d, D= -5/6 × 4/19 + -7/12 × 4/19 - 40/57
e, E= 3/7 × 9/26 - 1/14 × 1/13 - 1/7
a, \(A=\dfrac{1}{3}.\dfrac{-6}{-3}.\dfrac{-9}{10}.\dfrac{-13}{36}\)
\(A=\dfrac{1.\left(-6\right).\left(-9\right).\left(-13\right)}{3.13.10.36}\)
\(A=\dfrac{-1}{10.2}\)
\(A=\dfrac{-1}{20}\)
b, \(B=\dfrac{-1}{3}.\dfrac{-15}{17}.\dfrac{34}{45}\)
\(B=\dfrac{\left(-1\right).\left(-15\right).34}{3.17.45}\)
\(B=\dfrac{2}{3.3}\)
\(B=\dfrac{2}{9}\)
c, \(C=\dfrac{1}{3}.\dfrac{4}{5}+\dfrac{1}{3}.\dfrac{6}{5}+\dfrac{2}{3}\)
\(C=\dfrac{1}{3}.\left(\dfrac{4}{5}+\dfrac{6}{5}\right)+\dfrac{2}{3}\)
\(C=\dfrac{1}{3}.2+\dfrac{2}{3}\)
\(C=\dfrac{2}{3}+\dfrac{2}{3}\)
\(C=\dfrac{4}{3}\)
d, \(D=\dfrac{-5}{6}.\dfrac{4}{19}+\dfrac{-7}{12}.\dfrac{4}{19}-\dfrac{40}{57}\)
\(D=\dfrac{4}{19}.\left(\dfrac{-5}{6}+\dfrac{-7}{12}\right)-\dfrac{40}{57}\)
\(D=\dfrac{4}{19}.\dfrac{-17}{12}-\dfrac{40}{57}\)
\(D=\dfrac{-17}{57}-\dfrac{40}{57}\)
\(D=\dfrac{-57}{57}=-1\)
e, \(E=\dfrac{3}{7}.\dfrac{9}{26}-\dfrac{1}{14}.\dfrac{1}{13}-\dfrac{1}{7}\)
\(E=\dfrac{3}{7}.\dfrac{9}{26}-\left(\dfrac{1}{14}.\dfrac{1}{13}+\dfrac{1}{7}\right)\)
\(E=\dfrac{3}{7}.\dfrac{9}{26}-\left(\dfrac{1}{182}+\dfrac{1}{7}\right)\)
\(E=\dfrac{3}{7}.\dfrac{9}{26}-\dfrac{27}{182}\)
\(E=\dfrac{27}{182}-\dfrac{27}{182}\)
\(E=0\)
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tinh 1 cach hop li; a, -39.(5-99)+99.(10-39) b,153.177-153.77...
Đọc tiếp
tinh 1 cach hop li; a, -39.(5-99)+99.(10-39) b,153.177-153.77 c, 199.(15-17)-99.(-17+5) d, 73.(18-59)-59.(8-73)
a: =-39*5+39*99+99*10-99*39
=-39*5+99*10
=990-195=795
b: =153(177-77)=15300
c: =199*15-199*17+99*17-99*5
=17(-100)+199*15-99*5
=790
d: =73*18-73*59-59*8+59*73
=73*18-59*8
=842
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