Tinh nhanh
a ) 43 - 17 + 28 + 57 + 67 + 20
b ) 26 + 47 + 14
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=?
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
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 * 55 * 56 * 57 * 58 * 59 * 60 * 61 * 62 * 63 * 64 * 65 * 66 * 67 * 68 * 69 * 70 * 71 * 72 * 73 * 74 * 75 * 76 * 77 * 78 * 79 * 80 * 81 * 82 * 83 * 84 * 85 * 86 * 87 * 88 * 89 * 90 * 91 * 92 * 93 * 94 * 95 * 96 * 97 * 98 * 99 * 100 bằng bao nhiêu?
Câu 1 : tính nhanh
a) ( -7) . 11 + 7 . ( - 89 )
b) ( -57) . ( 67 - 34) - 67 . ( 34 - 57 )
c) ( 17 - 25 ) - ( - 37 - 25 + 17 )
d) - ( -72 - 25 + 17 ) + ( - 72 + 17 )
e) ( -25 ) . ( -13) .8 (-4).125
f) 38 . (-43) + 43 . (-79) - (-43) . 17
e, (-25).(-13).8.(-4).125
= (-25).(-4).8.125.(-13)
= 100.1000.(-13)=-1300000
f, 38.(-43)+43.(-79)-(-43).17
= 38.(-43)+(-43).79-(-43).17
= (-43).(38+79-17)
= (-43).100=-4300
a) ( -7) . 11 + 7 . ( - 89 )
= 7 . (-11) + 7 . (-89)
= 7 . [(-11)+(-89)]
= 7 . (-100)
= -700
b, (-57).(67-34)-67.(34-57)
= -57.67+57.34-67.34+67.57
= 34(57-67)=34.(-10)=-340
c, (17-25)-(-37-25+17)
= 17-25+37+25-17
=37
d, -(-72-25+17)+(-72+17)
= 72+25-17-72+17= 25
tinh nhanh (46-26).(-5)+25.(-11-19)
b)(-57).(67-34)-67.(34-57)
tinh nhanh
a)(46-26).(-5)+25.(-11-19)
(-57).(67-34)-67.(34-57)
tính 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+50-999-888-777-666-555-444-333-222-111
nhanh nhé
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+4
7+48+49+50-999-888-777-666-555-444-333-222-111= -3720
Tính nhanh
a) 4 7 + 3 4 + 2 7 + 5 4 + 1 7
b) − 5 7 + 3 4 + − 1 5 + − 2 7 + 1 4
a) 4 7 + 3 4 + 2 7 + 5 4 + 1 7 = 4 7 + 2 7 + 1 7 + 3 4 + 5 4 = 3
b) − 5 7 + 3 4 + − 1 5 + − 2 7 + 1 4 = − 5 7 + − 2 7 + 3 4 + 1 4 + − 1 5 = − 1 + 1 + − 1 5 = − 1 5