53/12 * 23/46 * 21/4
Tìm x,biết:
a,23-x=53
b,(-12)-x=46
c,x-(-17)=10
(6+x)-(17-21)==25
GIẢI GIÚP MIK NHA, MIK TIK CHO
a, x=23-53=-30
b, x=-58
c,x=-7
d,6+x+4=25<=>x=15
tINH NHANH
A ) 78. 123 + 88 .33 - 78 x 23 + 11.8.67
b)42 . 53 + 47.156 _ 114.47
c ) 53 . 39 + 39 . 47 - 15 . 21 - 7 . 155
d ))15 . 37 . 4 + 120 . 21 + 21 x 5 x12
e ) 2 . 53 . 12 4 . 6 . 87 _ 15 . 4
g ) (2500 + 75 ) : 25 - ( 36 . 11 ) : 1
a.[ 461 +(—78) + 40 ] + (—46).
b.[ 53 + (—76 ) — [ — 76 — (— 53 ) ].
c.—564 + ( —724 ) + 564 + 224 ].
d.— 87 + ( 12 ) — (—487 ) +512.
e.942— 2567 + 2563 — 1942.
f.17 + (—20 ) + 23 + (—26 ) + ...+ 53 + (— 56 ).
g.1152 — ( 374 + 1152 ) + (— 65 + 374 ).
h.— 2005 + ( — 21 + 75 + 2005 ).
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cái này tính hả em
bỏ dấu ngoặc rồi tính:
1)(38-42+14)-(25-27-15)
2)(12+21)-(23-21+10)
3)(57-725)-(605-53)
4)(55+45+15)-(15-55+45)
\(1,=38-42+14-25+27+15=27\)
\(2,=12+21-23+21-10=21\)
\(3,=57-725-605+53=-1220\)
\(4,=55+45+15-15+55-45=110\)
\(\text{1.(38-42+14)-(25-27-15)}\\ =38-42+14-25+27+15\\ =-4-11+42\\ =27\)
\(\text{2.(12+21)-(23-21+10)}\\ =12+21-23+21-10\\ =33+44-10=67\)
1,=38−42+14−25+27+15=271,=38−42+14−25+27+15=27
2,=12+21−23+21−10=212,=12+21−23+21−10=21
3,=57−725−605+53=−12203,=57−725−605+53=−1220
4,=55+45+15−15+55−45=110
1 . Tính nhanh
a/ 15 . ( 27 + 18 + 6 ) + 15 . ( 23 + 12 )
b/ 14 . 35 . 5 + 10 . 25 .7 + 20 . 70
c/ 53 . ( 51 + 4 ) + 53 . ( 49 + 96 ) + 53
d/ 46 . ( 27 + 75 ) + 8 . ( 58 + 25 ) . 2
a) 15 . (27 + 18 + 6 ) + 15 . ( 23 +12 ) = 15. 51 + 15 . 35 = 765 + 525 = 1290
b) 14 . 35 . 5 + 10 . 25 . 7 + 20 . 70 = 2450 + 1750 + 1400 = 2452450
c) 53 . ( 51 + 4 ) + 53 . ( 49 + 96 ) + 53 = 53 . 55 + 53 . 145 + 53 = 2915 . 7685 = 22401775
d) 46 . ( 27 +75 ) +8 . ( 58 + 25 ) + 8 . ( 58 + 25 ) . 2 = 46 . 102 + 8 . 83 + 8 . 83 = 4692 + 664 + 664 = 6020
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=?
15*37*4+120*21+21*5*12
15*(27+18+6)+15*(23+12)
10*(81+19)+100+50*(91+9)
42*(15+96)+6*(25+4)*7
16*(27+75)+8*(53+25)*2
tinh nhanh
a, 39*49-39*17 b,12*53+53*172-53*84
c,17+18+19+99 d, 23+25+49
e,46-45+44-43
a, 39*49-39*17
= 39 (49 - 17)
= 39 * 32
= 1248
b,12*53+53*172-53*84
= 53 (12 + 172 -84)
= 53 * 100
= 5300
c,17+18+19+99
= 17 + 17 +1 + 17 +2 + 99
= 3 * 17 + (1+ 99) + 2
= 151 +2
= 153
d, 23+25+49
= 48 + 49
= 97
e,46-45+44-43
= (46 + 44) + (-45 -43)
= 88 + (-88)
= 0