Tính hợp lí: a)9.(5 -11)-45
b)35.(45-79)+45.(79-35)
c)42-6.(11+7)
d)17.(25-31)-25.(17-31)
Những câu hỏi liên quan
Tính hợp lí :
a) (-37-17).(-9)+35.(-9-11)
b) (-25)(75-45)-75(45-25)
4 tháng 4 2023 lúc 19:01
Tính nhanh
a) 31/23 - (7/32 + 8/23)
b) 38/45 - (8/45 - 17/51 - 3/11)
c)(1/3 + 12/67 + 13/41) - ( 79/67 - 28/41)
d) 1/5 + -1/6 + 1/7 + -1/8 + 1/9 + 1/8 + -1/7 + 1/6 + -1/5
4 tháng 4 2023 lúc 19:12
Tính nhanh
a) 31/23 - (7/32 + 8/23)
b) 38/45 - (8/45 - 17/51 - 3/11)
c)(1/3 + 12/67 + 13/41) - ( 79/67 - 28/41)
d) 1/5 + -1/6 + 1/7 + -1/8 + 1/9 + 1/8 + -1/7 + 1/6 + -1/5
`a,`
`31/23-(7/32+8/23)`
`=31/23-7/32-8/23`
`=(31/23-8/23)-7/32`
`=1-7/32=25/32`
`b,`
`38/45-(8/45-17/51-3/11)`
`=38/45-8/45+17/51+3/11`
`= (38/45-8/45)+17/51+3/11`
`=2/3+17/51+3/11`
`=1+3/11=14/11`
`c,`
`(1/3+12/67+13/41)-(79/67-28/41)`
`= 1/3+12/67+13/41-79/67+28/41`
`= 1/3+(12/67-79/67)+(13/41+28/41)`
`= 1/3+(-1)+1=1/3+(-1+1)=1/3+0=1/3`
`d,`
`1/5+(-1/6)+1/7+(-1/8)+1/9+1/8+(-1/7)+1/6+(-1/5)`
`= (1/5+ -1/5)+(-1/6+1/6)+(1/7+ -1/7)+(-1/8 +1/8)+1/9`
`= 0+0+0+0+1/9=1/9 .`
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tính bằng cách hợp lí nhất
a) 31/23 - (7/23 + 8/23)
b) (1/3 + 12/67 + 13/41 ) - (79/67 - 28/41 )
c) 38/45 - ( 8/45 - 17/51- 3/11 )
Tính hợp lí: a. 31/23 - (7/23 + 8/23). b.(1/3 + 12/67+13/41) - (79/67 - 28/41). c. 38/45 - (8/45 - 17/51 - 3/11)
\(a\frac{31}{23}-\left(\frac{7}{23}+\frac{8}{23}\right)\)
\(=\frac{31}{23}-\frac{7}{23}-\frac{8}{23}\)
\(=\frac{16}{23}\)
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a)\(\frac{31}{23}-\left(\frac{7}{23}+\frac{8}{23}\right)=\frac{31}{23}-\frac{8}{23}+\frac{7}{23}=1+\frac{7}{23}=1\frac{7}{23}\)
b)\(\left(\frac{1}{3}+\frac{12}{67}+\frac{13}{41}\right)-\left(\frac{79}{67}-\frac{28}{41}\right)=\left(\frac{13}{41}+\frac{28}{41}\right)+\left(\frac{79}{67}-\frac{12}{67}\right)-\frac{1}{3}=1+1-\frac{1}{3}\)
\(=2-\frac{1}{3}=\frac{5}{3}\)
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Tính hợp lí
a, -2/5×4/7+-3/5×2/7+-3/5
b,5/9×14/17+1/17×5/9+2/9+5/12
c,-4/25÷11/79+15/11÷25/79
d, (2/101÷5/9+-3/7)×(6/5÷1/3)
a)\(-\dfrac{2}{5}.\dfrac{4}{7}+\dfrac{-3}{5}.\dfrac{2}{7}+\dfrac{-3}{5}\)
=\(-\dfrac{2}{5}.\dfrac{4}{7}+\dfrac{3}{7}.\dfrac{-2}{5}+\dfrac{-3}{5}\)
=\(-\dfrac{2}{5}.\left(\dfrac{4}{7}+\dfrac{3}{7}\right)+\dfrac{-3}{5}\)
=\(\dfrac{-2}{5}.1+\dfrac{-3}{5}\)
=\(-\dfrac{2}{5}+\dfrac{-3}{5}\)
=\(-\dfrac{5}{5}\) = -1
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\(\dfrac{5}{9}.\dfrac{14}{17}+\dfrac{1}{17}.\dfrac{5}{9}+\dfrac{2}{9}+\dfrac{5}{12}\)
=\(\dfrac{5}{9}.\left(\dfrac{14}{17}+\dfrac{1}{17}\right)+\dfrac{2}{9}+\dfrac{5}{12}\)
=\(\dfrac{5}{9}.\dfrac{15}{17}+\dfrac{2}{9}+\dfrac{5}{12}\)
=\(\dfrac{25}{51}+\dfrac{2}{9}+\dfrac{5}{12}\)
=\(\dfrac{691}{612}\)
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\(-\dfrac{4}{25}:\dfrac{11}{79}+\dfrac{15}{11}:\dfrac{25}{79}\)
=\(-\dfrac{4}{25}.\dfrac{79}{11}+\dfrac{15}{11}.\dfrac{79}{25}\)
=\(-\dfrac{4}{25}.\dfrac{79}{11}+\dfrac{15}{25}.\dfrac{79}{11}\)
=\(\left(-\dfrac{4}{25}+\dfrac{15}{25}\right).\dfrac{79}{11}\)
=\(\dfrac{11}{25}.\dfrac{79}{11}\)
=\(\dfrac{79}{25}\)
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Tính hợp lý(nếu có thể)
a, (-37-17).(-9)+35.(-9-11)
b, (-25).(75-45)-75.(45-25)
c, (-8).25.(-2).4.(-5).125
d, 19.25+9.95+19.30
tính "trâu đát" luôn nha bạn!(trâu đất là tính bình thường) : )
Bài 1 : Tính nhanh
a) (-48)-72+36*(40-404)
b) 25*(-23)+47*(-35)-20*(-35)
c) 29*(67)-45*67+26*(67)
d) 4*(-5)-125*(-2)mũ 3+(-10) mũ 3*(-2)
Bài 2: Tính nhanh
a) (26-6)*(-4)+31*(-7-13)
b) (47-17)*(-5)+22*(-13-17)
c) (35-85)*11+29*(-14-36)
d) (153-53)*(-37)+37*(-42-58)
Giúp mình với nhé
a) (26-6)*(-4)+31*(-7-13)
=-80+-620
=-700
hacker 2k6
(-50+19+143)-(-79+25+48)
(-25)(75-45)-75(45-25)
(-37-17).(-9)+35.(-9-11)
(187-23)-(20-180)
512.(2-128)-128.(-512)
17.(-25)+25.21
Giải rõ ra nha ! Mình cần gấp !
\(=\left(-50+19+143\right)-\left(-79+25+48\right)\)
\(=-50+19+143+79-25-48\)
\(=118\)
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\(\left(-25\right)\left(75-45\right)-75\left(45-25\right)\)
\(\left(-25\right).30-75.20\)
\(=-2250\)
\(\left(-37-17\right).\left(-9\right)+35\left(-9-11\right)\)
\(-54.\left(-9\right)+35.\left(-20\right)\)
\(-763\)
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