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a) 118 - 26 + 76 - 18
= 92 + 58
= 150
b) 45 - 36 : 32
= 45 - 4
= 41
c) 90 : {[52 - ( 42 - 5 )] . 3 }
= 90 : [( 52 - 37 ) . 3]
= 90 : ( 15 . 3 )
= 90 : 45
= 2
a 118-26=76-18=(118-18)+76-26)=150
b45-36:3 mũ 2 = 45-9=41
c (mình ghi giấu ngoặc ko dc nha bn) kết quả =90:(52-37).3=90:15.3=18
K MIK NHA BN
a)\(118-26+76-18=92+76-18=168-18=150\)
b)\(45-36\div3^2=45-36\div9=45-4=41\)
c)\(90\div\left[52-\left(42-5\right).3\right]=90:\left[52-37.3\right]=90:\left[52-111\right]\)
\(=90:\left(-59\right)=\frac{-90}{59}\)
nhabinn2011
a, 118 - 26 + 76 - 18
= 92 + 76 - 18
= 168 - 18
= 150
b, 45 - 36 : 3\(^2\)
= 45 - 36 : 9
- 45 - 4
= 41
c, 90 : { 52 - ( 42 - 5 ) . 3 }
= 90 : { 52 - 37 . 3 }
= 90 : { 52 - 111 }
Đến đây thì bạn bị lộn đề phần c rồi.
90.18+14.118+118.76
=90.18+118.(14+76)
=90.18+118.90
=90.(18+118)
=90.136
=12240
90.18+(14.118+118.76)
=90.18+118(14+76)
=90.18+118.90
=90.(18+118)
=90.136
=12240
2+4+6+8+10+...+118+120
=(120+2).[(120-2):2+1]:2
=122.60:2
=6720:2
=3360
2+4+6+8+10+..+118+120
=(120+2).[(120-2):2+1]:2
=122.60:2
=7320:2
=3660
2x-(5-7)=x-14-7\(\Rightarrow2\chi+2=\chi-24\)
\(\Rightarrow2\chi:\chi=-24-2\)
\(\Rightarrow x=-26\)
HTDT
Ah . bn oi, mik sửa chút!
\(2\chi:\chi=-24-2\Rightarrow\chi+1=-26\)
\(\Rightarrow\chi=-26-1\Rightarrow\chi=-27\)
kk
a) \(39\times118+29\times82\)
\(=39\times2\times59+29\times2\times41\)
\(=2\times\left(39\times59+29\times41\right)\)
\(=2\times\left(2301+1189\right)\)
\(=2\times3490\)
\(=6980\)
b) \(37\times39+78\times14-13\times85-52\times55\)
\(=37\times3\times13+6\times13\times14+13\times85-4\times13\times55\)
\(=13\times\left(37\times3+6\times14+85-4\times55\right)\)
\(=13\times\left(111+84+85-220\right)\)
\(=13\times\left(280-220\right)\)
\(=13\times60\)
\(=780\)
c) \(368:16+752:16+480:16\)
\(=\left(368+752+480\right):16\)
\(=\left(1120+480\right):16\)
\(=1600:16\)
\(=100\)
d) \(5\times11\times18+9\times31\times10+4\times29\times45\)
\(=5\times11\times9\times2+9\times31\times10+2\times2\times29\times5\times9\)
\(=10\times9\times11+10\times9\times31+10\times29\times2\times9\)
\(=90\times11+90\times31+90\times29\times2\)
\(=90\times\left(11+31+29\times2\right)\)
\(=90\times\left(42+58\right)\)
\(=90\times100\)
\(=9000\)
=12240