2*5*67*784*54*42*0 = ??
Tính nhanh:(chỉ có 5 phút để trả lời)
42 + 43 + 44 + 45 - 32 - 33 - 34 - 35
(64+ 65+ 66+ 67+ 68) - (54 + 55 + 56 + 57 + 58)
42 + 43 + 44 + 45 - 32 - 33 - 34 - 35
= (42 - 32)+(43 - 33)+(44 - 34)+(45 - 35)
= 10+10+10+10
= 40
(64+65+66+67+68) - (54+55+56+57+58)
= 64+65+66+67+68 - 54-55-56-57-58
= (64 - 54)+(65 - 55) +(66 - 56) + (67- 57) + (68 -58)
= 10+10+10+10+10
= 50
câu 1 40
câu 2 50
nha
Bài 6:
e,-(-12 + 25 - 38) + ( 25 -38 + 88 ) - 250
f, ( -12 ).( 67-23 ) + 44.( -88 )
g,( -48 + 54 - 77 ) - ( 24 - 48 - 77 )
h, 11.( -42 - 26 ) + 42 . ( 11+26 )- 26.11 - 42.26
e. = 12 - 25 + 38 + 25 - 38 + 88 - 250
= ( -25 + 25) + (38 - 38) + ( 12 + 88) - 250
= -150
f. = (-12).44 + 44.(-88)
= 44 ( -12 -88 )
= 44 . 100
= 4400
g. = -48 + 54 -77 -24 + 48 + 77
= (-48 + 48) + (-77+77) + (54 -24)
= 30
h. = 11.(-42) + 11.(-26) + 42.11 + 42.26 -26.11 - 42.26
= \([11.\left(-42\right)+11.42]+\left[11.\left(-26\right)-26.11\right]+[42.26-42.26]\)
= 11. (-52)
= - 572
\(e.-\left(-12+25-38\right)+\left(25-38+88\right)-250\\ =12-25+38+25-38+88-250\\ =\left(25-25\right)+\left(38-38\right)+\left(12+88\right)-250\\ =0+0+100-250=-150\)
\(f.\left(-12\right)\cdot\left(67-23\right)+44\cdot\left(-88\right)\\ =\left(-12\right)\cdot44+44\cdot\left(-88\right)\\ =44\cdot\left[-12+\left(-88\right)\right]\\ =44\cdot\left(-100\right)=-4400\)
\(g.\left(-48+54-77\right)-\left(24-48-77\right)\\ =-48+54-77-24+48+77\\ =\left(48-48\right)+\left(54-24\right)+\left(77-77\right)\\ =0+30+0=30\)
\(h.11\cdot\left(-42-26\right)+42\cdot\left(11+26\right)-26\cdot11-42\cdot26\\ =11\cdot\left(-68\right)+42\cdot37-26\cdot11-42\cdot26\\ =-748+1554-286-1092=-572\)
[(46 - 32)^2 - (54 - 42)^2] . 2 . x - 1872 = 0
[(46 - 32)^2-(54-42)^2].2.x-1872=0
A , 324x49:98+4674:82x19
B , 156+6794:79
C , 7055: 83+124+784:23x46
D , 1005-38892:42
A , 324x49:98+4674:82x19
=15876:98+4674:82x19
=1984.5+4674:82x19
=1984.5+1083
=3067.5
B , 156+6794:79
=156+86
=242
A.324 x 49 : 98 + 4674 : 82 x 19
=15876 : 98 + 4674 : 82 x 19
=1984.5 + 4674 : 82 x 19
=1984.5 + 1083
=3067.5
B.156+6794:79
=156+86
=242
C. 7055 : 83 + 124
= 85 + 124
= 209
C.784 x 23 : 46
= 18032 : 46
= 392
D. 1005 - 38892 : 42
= 1005 - 926
= 79
C , 7055: 83+124+784:23x46
=85+124+784:23x46
=209+1568
=1777
D , 1005 - 38892 : 42
= 1005 - 926
= 79
42-56+33-(33-56+42)
54-(45-30+54)-30+5
42-56+33-(33-56+42)
=42-56+33-33+56-42
=0
54-(45-30+54)-30+5
=54-45+30-54-30+5
=-40
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 giá trị biểu thức: a) P=54+(-37+10-54+67)
b) Q=1+2-3-4+5+6-7-8+.......
Help me T+T
a 5 . [ 225 - (x -10) -125 = 0
b (x-15) : 5 + 22 =24
c 42 - (2x +32) + 12 : 2 =6
d 134 - 2 : { 156 - 6 .[54 -2 . (9 + 6)]} .x =86
Mh cần gấp nha
\(5.\left[225-\left(x-10\right)-125\right]=0\)
\(225-\left(x-10\right)-125=0:5\)
\(225-\left(x-10\right)-125=0\)
\(\left(x-10\right)-125=225-0\)
\(\left(x-10\right)-125=225\)
\(x-10=225+125\)
\(x-10=350\)
Mấy bài này làm theo thứ tứ trái sang phải, nhân chia trc cộng trừ sau thoi mà :>>>?
Quên, thứ tự ngoặc là { [ ( ) ] } nha :))))))))))))))))