Câu 1:
8x427x3+6x573x4
=(8x3)x427+(6x4)x573
=24x427+24x573
=24x(427+573)
=24x1000
=24000
Câu 2: 6x1235x20-5x235x24
=(6x20)x1235-(5x24)x235
=120x1235-120x235
=120x(1235-235)
=120x1000
=120000
Câu 3:
54x47-47x53-20-27
=47x(54-53)-20-27
=47x1-(20+27)
=47-47
=0
Tinh tong cac ao nguyen x biet
1/ -20<x<21
2/-18=<x=<17
3/-27<x=<27
4/ |x|=<3
5/ |x|<5
thuc hien phep tinh
( 5*4^15*9-4*3^20*8^9) /( 5*2^9*6^19-7*2^29*27^6)
Thuc hien phep tinh) A = \(\frac{5.2^{30}.3^{18}-4.3^{20}2^{27}}{5.2^9.2^{19}.3^{19}-7.2^{29}.3^{18}}\)
tinh nhanh (-27)+20+(-9)+27+(-11)
tinh nhanh
a,A=100+98+96+...+2-97-95-...-1
b,B=1+2-3-4+5+6-7-8+9+10-11-12+...-229-330+301+302
c,C=41*66+34*41/3+7+11+...+79
d,D=1+2+3+...+200/6+8+10+...+34
e,E=1*5*6+2*10*12+20*24*4+9*45*54/1*3*5+2*6*10+4*12*20+9*27*45
cho
a,A=5*4^15*9^9-4*3^20*8^9và B=5*2^9*6^19-7*2^29*27^6 tinh a/b
tinh C=9*5^20*27^9-3*9^15*25^9/7*3^29*125^6-3*3^9*15^19
cho S = 1-2+2^2-2^3+...+2^26-2^27.tinh 3.S+2^28
thuc hien phep tinh
73 . 35 + 27 . 19 - 20 . 73 + 81 . 27 + 85 . 73
