35 + 20 + 55 + 90 = ?
35 + 20 + 55 + 90 = ?
35 + 20 + 55 + 90
= ( 35 + 55 ) + ( 20 + 90 )
= 100 + 110
= 210
35 + 20 + 55 + 90
= ( 35 + 55 ) + ( 90 + 20 )
= 90 + 110
= 200
nha
Tính Nhanh: (1/10) + (4/20) + (9/30) + (16/40) + (25/50) + (36/60) + (49/70) + (6+80) + (81/90) + (100/100) = ?
A.66/35 B.55/1000
C.55/100 D.1234/5678
GIẢI ĐẦY ĐỦ NHANH VÀ ĐÚNG!
Đúng ghi Đ sai ghi S
a,(55 + 35):5=55:5+35:5
=11+7
=18
b,(41+22):3=41:3+22:3
= 13 + 7
= 20
c,(55+35):5
=90:5
=18
d,(41+22):3
= 63 : 3
= 21
Hai góc M và N là hai góc bù nhau. Số đo góc M lớn hơn số đo góc N là 20 ° thì số đo góc M và góc N lần lượt là:
A. 120 ° v à 100 ° ;
B. 100 ° v à 80 ° ;
C. 55 ° v à 35 ° ;
D. 110 ° v à 90 ° .
a) (-10).35+10.(-12)-(-10)
b)20.(-345)+(-20).(-315)
c)25.(27-55)-27.(25-55)
d)25.(-415)+9(-15).418
e)5+(-8).3
MÌNH ĐANG CẦN GẤP NHA
a: \(\left(-10\right)\cdot35+10\cdot\left(-12\right)-\left(-10\right)\)
\(=\left(-10\right)\cdot35+\left(-10\right)\cdot12-\left(-10\right)\)
\(=-10\left(35+12-1\right)=-10\cdot46=-460\)
b: \(20\cdot\left(-345\right)+\left(-20\right)\cdot\left(-315\right)\)
\(=20\cdot\left(-345\right)+20\cdot315\)
\(=20\left(-345+315\right)=-30\cdot20=-600\)
c: \(25\left(27-55\right)-27\left(25-55\right)\)
\(=25\cdot27-25\cdot55-27\cdot25+27\cdot55\)
\(=27\cdot55-25\cdot55=2\cdot55=110\)
d: \(25\cdot\left(-415\right)+9\cdot\left(-15\right)\cdot418\)
\(=-25\cdot415-9\cdot15\cdot418\)
\(=-5\left(5\cdot415+3\cdot9\cdot418\right)\)
\(=-5\left(2075+11286\right)=-5\cdot13361=-66805\)
e: \(5+\left(-8\right)\cdot3\)
=5-24
=-19
Rút gọn phân số :-72/45 ;9/21 ;-16/44;-15/-35;-20/-55;-32/20
Ta có: \(-\frac{72}{45}=\frac{-72:9}{45:9}=\frac{-8}{5}\)
\(\frac{9}{21}=\frac{9:3}{21:3}=\frac{3}{7}\)
\(-\frac{16}{44}=\frac{-16:4}{44:4}=-\frac{4}{11}\)
\(\frac{-15}{-35}=\frac{-15:\left(-5\right)}{-35:\left(-5\right)}=\frac{3}{7}\)
\(\frac{-20}{-55}=\frac{-20:\left(-5\right)}{-55:\left(-5\right)}=\frac{4}{11}\)
\(-\frac{32}{20}=\frac{-32:4}{20:4}=-\frac{8}{5}\)
Tính nhanh : a, 5/6 +11/12+19/20+29/30+41/42+55/56+71/72+89/90
b, ính tổng của 10 phân số trog phép cộng sau :
1/2 + 5/6+ 11/12 + 19/20 + 29/30 + 41/42 + 55/56 + 71/72 + 89/90 + 109/110
a) \(\frac{5}{6}+\frac{11}{12}+\frac{19}{20}+\frac{29}{30}+\frac{41}{42}+\frac{55}{56}+\frac{71}{72}+\frac{89}{90}\)
\(=1-\frac{1}{6}+1-\frac{1}{12}+1-\frac{1}{20}+1-\frac{1}{30}+1-\frac{1}{42}+1-\frac{1}{56}+1-\frac{1}{72}+1-\frac{1}{90}\)
\(=8-\left(\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+\frac{1}{90}\right)\)
\(=8-\left(\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}\right)\)
\(=8-\left(\frac{3-2}{2.3}+\frac{4-3}{3.4}+\frac{5-4}{4.5}+\frac{6-5}{5.6}+\frac{7-6}{6.7}+\frac{8-7}{7.8}+\frac{9-8}{8.9}+\frac{10-9}{9.10}\right)\)
\(=8-\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}\right)\)
\(=8-\left(\frac{1}{2}-\frac{1}{10}\right)=7,6\)
b) Bạn làm tương tự.
mnbvcxzasdf
Tính nhanh:
a) 5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90
b) Tính tổng của 10 phân số trong phép cộng sau:
1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/7289/90
\(\frac{5}{6}+\frac{11}{12}+\frac{19}{20}+...+\frac{89}{90}\)
\(=1-\frac{1}{6}+1-\frac{1}{12}+1-\frac{1}{20}+...+1-\frac{1}{90}\)
\(=8-\left(\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{90}\right)\)
\(=8-\left(\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{9.10}\right)\)
\(=8-\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+....+\frac{1}{9}-\frac{1}{10}\right)\)
\(=8-\left(\frac{1}{2}-\frac{1}{10}\right)\)
\(=\frac{38}{5}\)
`Answer:`
a) \(\frac{5}{6}+\frac{11}{12}+\frac{19}{20}+\frac{29}{30}+\frac{41}{42}+\frac{55}{56}+\frac{71}{72}+\frac{89}{90}\)
\(=1-\frac{1}{6}+1-\frac{1}{12}+1-\frac{1}{20}+1-\frac{1}{30}+1-\frac{1}{42}+1-\frac{1}{56}+1-\frac{1}{72}+1-\frac{1}{90}\)
\(=8-\frac{1}{6}-\frac{1}{12}-\frac{1}{20}-\frac{1}{30}-\frac{1}{42}-\frac{1}{56}-\frac{1}{72}-\frac{1}{90}\)
\(=8-\left(\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+\frac{1}{90}\right)\)
\(=8-\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}\right)\)
\(=8-\frac{2}{5}\)
\(=\frac{38}{5}\)
b) \(\frac{1}{2}+\frac{5}{6}+\frac{11}{12}+\frac{19}{20}+\frac{29}{30}+\frac{41}{42}+\frac{55}{56}+\frac{71}{72}+\frac{89}{90}\)
\(=1-\frac{1}{2}+1-\frac{1}{6}+1-\frac{1}{12}+1-\frac{1}{20}+1-\frac{1}{30}+1-\frac{1}{42}+1-\frac{1}{56}+1-\frac{1}{72}+1-\frac{1}{90}\)
\(=9-\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+\frac{1}{90}\right)\)
\(=9-\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}\right)\)
\(=9-\left(1-\frac{1}{10}\right)\)
\(=\frac{81}{10}\)
a.\(74\frac{19}{35}.\frac{7}{90}+15\frac{16}{35}.\frac{7}{90}+2\frac{14}{90}\)
b,\(\left(\frac{-2}{5}+\frac{3}{7}\right)-\left(\frac{4}{9}+\frac{12}{20}-\frac{13}{35}\right)+\frac{7}{35}\)
AI GIAI DUOC MINH CHO 20 TICK
a) \(74\frac{19}{35}.\frac{7}{90}+15\frac{16}{35}.\frac{7}{90}+2\frac{14}{90}\)
= \(\left(74\frac{19}{35}+15\frac{16}{35}\right).\frac{7}{90}+2\frac{14}{90}\)
= 90 . 7/90 + 194/90
= 630/90 + 194/90
= 824/90 = 412/45
b) (-2/5 + 3/7) - (4/9 + 12/20 - 13/35) + 7/35
= -2/5 + 3/7 - 4/9 - 3/5 + 13/35 + 7/35
= (-2/5 - 3/5) + 3/7 - 4/9 + (13/35 + 7/35)
= -1 + 3/7 - 4/9 + 4/7
= -1 + (3/7 + 4/7) - 4/9
= -1 + 1 - 4/9 = -4/9