\(\frac{-45+58-45+42}{2+4+6+....+16+18}\)
giúp mk với
45*8+45*42/2+4+6+...+16+18
-12/18 + (-21)/35
-3/21 + 6/42
-18/24 + 15/21
1/6 + 2/5
3/5 + (-7)/4
(-2) + (-5)/8
1/-8 + (-5)/9
4/13 + 12/39
1/21 + 1/28
-3/29 + 16/58
8/40 + (-36)/45
-8/18 + (-15)/27
13/30 + (-1)/5
2/21 + 1/28
5 + (-3)/4
18/24 + 45/-10
câu 1)
\(\dfrac{-12}{18}+\left(\dfrac{-21}{35}\right)=\dfrac{-19}{15}\)
câu 2)
\(-\dfrac{3}{21}+\dfrac{6}{42}=0\)
câu 3)
\(-\dfrac{18}{24}+\dfrac{15}{21}=-\dfrac{1}{28}\)
câu 4)
\(\dfrac{1}{6}+\dfrac{2}{5}=\dfrac{17}{30}\)
câu 5)
\(\dfrac{3}{5}+\left(-\dfrac{7}{4}\right)=-\dfrac{23}{20}\)
câu 6)
\(\left(-2\right)+\left(\dfrac{-5}{8}\right)=\dfrac{-21}{8}\)
câu 7)
\(\dfrac{1}{-8}+\left(-\dfrac{5}{9}\right)=-\dfrac{49}{72}\)
câu 8)
\(\dfrac{4}{13}+\dfrac{12}{39}=\dfrac{8}{13}\)
câu 9)
\(\dfrac{1}{21}+\dfrac{1}{28}=\dfrac{1}{12}\)
câu 10)
\(-\dfrac{3}{29}+\dfrac{16}{58}=\dfrac{5}{29}\)
câu 11)
\(\dfrac{8}{40}+\left(-\dfrac{36}{45}\right)=-\dfrac{3}{5}\)
câu 12)
\(-\dfrac{8}{18}+\left(-\dfrac{15}{27}\right)=-1\)
câu 13)
\(\dfrac{13}{30}+\left(-\dfrac{1}{5}\right)=\dfrac{7}{30}\)
câu 14)
\(\dfrac{2}{21}+\dfrac{1}{28}=\dfrac{11}{84}\)
câu 15)
\(5+\left(-\dfrac{3}{4}\right)=\dfrac{17}{4}\)
câu 16)
\(\dfrac{18}{24}+\dfrac{45}{-10}=-\dfrac{15}{4}\)
giúp mk với
18+(-6)+23+(-7)-5
-25+34-(16-45)
[4-(-21)+7]-5
18+(-6)+23+(-7)-5=[18+(-6)]+23+[(-7)-5]
=12+23+(-12)=23
\
bn giúp mk câu còn lại nữa nha
Trả lời:
a, 18 + (-6) + 23 + (-7) - 5
= 12 + 23 + [ (-7) - 5 ]
= 12 + 23 + (-12)
= 23
b,-25 + 34 - (16 - 45)
= -25 + 34 - 16 + 45
= (-25 + 45) + (34 - 16)
= 20 + 18
= 38
c, [ 4 - (-21) + 7 ] - 5
= 4 + 21 + 7 - 5
= 25 - 5 + 7
= 20 + 7
= 27
Hok tốt!
Tính nhanh:
\(\frac{45+16-17}{45x15+18}\)
Giúp mk mk tik 3 tik 1 ngày
\(\frac{45+16-17}{45x15+18}\)
=\(\frac{44}{693}\)
=\(\frac{4}{63}\)
giúp mk với
(x+16/49)+(x+18/47)=(x+20/45)-1
\(x+\frac{16}{49}+x+\frac{18}{47}=x+\frac{20}{45}-1\)
\(2x+\frac{16}{49}+\frac{18}{47}-x-\frac{20}{45}=-1\)
\(x+\frac{5494}{20727}=-1\)
\(x=-1-\frac{5494}{20727}=-\frac{26221}{20707}\)
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50+51+52+53+54+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70=?
tính nhanh
3) 14.35.5+10.25.7+20.7
4) 15(27+18+6)+ 15(23.12)
5) 24(15+49)+12(50+42)
6) 10(81+19)+100+50(91+9)
7) 53(51+4)+53(49+96)+53
8)42(15+96)+6(25+4).7
9) 45(13+78)+9(87+22).5
10) 16(27+75)+8(53+25).2
giúp mik nhé các bạn mong các bạn giúp đỡ
5) 24*(15+49)+12*(50+42)
=24*64+12*92
=24*64+12*2*46
=24*64+24*46
=24*(64+46)
=24*110
=2640
7) 53*( 51+4)+53*(49+96)+53
=53*55+53*145+53
=53*(55+145)+53
=53*200+53
10600+53
=10653
Tính nhanh:
a, 45.(-24) + (-10).(-12)
b, (-134) + 51.134 + (-134).48
c, (-41).(59 + 2) + 59(41 - 2)
d, 369.(-2) - 41.82
e, (135 - 35).(-37) + 37.(-42 - 58)
Các bạn trình bày các bước giải giúp mk nhé! ^^