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a,136:{[(468+332):160-5]+68}+2014
= 136 : { [ ( 468 + 332 ) : 160 - 5 ] + 68 } + 2014
= 136 : { [ 800 : 160 - 5 ] + 68 } + 2014
= 136 : { [ 5 - 5 ] + 68 } + 2014
= 136 : { 0 + 68 } + 2014
= 136 : 68 + 2014
= 2 + 2014
= 2016
\(136:\left\{\left[\left(468+332\right):160-5\right]+68\right\}+2014\)
\(=136:\left[\left(800:160-5\right)+68\right]+2014\)
\(=136:\left[\left(5-5\right)+68\right]+2014\)
\(=136:\left(0+68\right)+2014\)
\(=136:68+2014=2+2014\)
\(=2016\)
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\(-\frac{1}{2}+\frac{2}{3}-\frac{3}{4}+\frac{4}{5}\)
\(=\left(-\frac{1}{2}-\frac{3}{4}\right)+\left(\frac{2}{3}+\frac{4}{5}\right)\)
\(=\left(-\frac{2}{4}-\frac{3}{4}\right)+\left(\frac{10}{15}+\frac{12}{15}\right)\)
\(=\left(\frac{-2-3}{4}\right)+\left(\frac{10+12}{15}\right)\)
\(=\left(\frac{-5}{4}\right)+\left(\frac{22}{15}\right)\)
\(=\frac{-75}{60}+\frac{88}{60}\)
\(=\frac{-75+88}{60}\)
\(=\frac{13}{60}\)
Mình ghi rõ từng chi tiết rồi nha , chúc bạn học tốt !!!
#)Giải :
Bài 1 :
\(A=\frac{15}{6.16}+\frac{15}{16.26}+\frac{15}{26.36}\)
\(A=3\left(\frac{5}{6.16}+\frac{5}{16.26}+\frac{5}{26.36}\right)\)
\(A=3\left(\frac{1}{6}-\frac{1}{16}+\frac{1}{16}-\frac{1}{26}+\frac{1}{26}-\frac{1}{36}\right)\)
\(A=3\left(\frac{1}{6}-\frac{1}{36}\right)\)
\(A=3.\frac{5}{36}\)
\(A=\frac{15}{36}\)
\(B=\frac{33}{6.16}-\frac{63}{16.26}+\frac{93}{26.36}\)
\(B=\frac{3.11}{6.16}-\frac{3.21}{16.26}+\frac{3.31}{26.36}\)
\(B=\frac{1}{2.16}.11+\frac{1}{2.16}.\frac{3.21}{13}+\frac{3.31}{26.36}\)
\(B=\frac{1}{32}.\frac{143-63}{13}+\frac{3.31}{26.12.3}\)
\(B=\frac{1}{32}.\frac{80}{13}+\frac{31}{36.12}\)
\(B=\frac{5}{26}+\frac{31}{26.12}=\frac{60+31}{26.12}=\frac{91}{26.12}=\frac{13.7}{13.2.12}=\frac{7}{24}\)
Bài 2 :
a)\(28.157-28.267+28.10\)
\(=28\left(157-267+10\right)\)
\(=28.-100\)
\(=-2800\)
b)\(\left(-5\right).4.\left(-2\right).23.\left(-25\right)\)
\(=\left[4.\left(-25\right)\right].\left[\left(-5\right).2\right].23\)
\(=\left(-100\right).\left(-10\right).23\)
\(=23000\)
2)
28 . 157 - 28 .267 + 28.10
=28.( 157 - 267 + 10 )
= 28 . -100
= -2800
3)
[(-2).(-5)]. 4 .-25.23
= 10 . -100 .23
=-23000
còn câu 1 mik suy nghĩ đã
\(-\frac{2}{3}+\frac{1}{5}.\frac{-10}{7}\\ =-\frac{2}{3}+\frac{1.-10}{5.7}\\ =-\frac{2}{3}+\frac{-2}{7}\\ =-\frac{14}{21}+\frac{-6}{21}\\ =-\frac{20}{21}\)
=\(\frac{-2}{3}+\frac{1}{5}.\frac{-10}{7}\)
=\(\frac{-2}{3}+\frac{-2}{7}\)
=\(\frac{-20}{21}\)
a) 45.37 + 45.63 - 100
\( 45.(37 + 63) – 100 \)
\(45.100 – 100\)
\(100.(45 – 1) \)
\( 100 . 44 = 4400\)
160 - 159 + 158 - 157 + ...... + 4 - 3 + 2 -1
=(160 - 159) + (158 - 157) + ...... + (4 - 3) + (2 -1) (80 hiệu)
=1 + 1 +...+ 1 + 1 (80 số hạng)
=1.80
=80