X x 26 + X x 74 =31600
tiếp nè
Giải phương trình:\(\frac{x+73}{27}+\frac{x+74}{26}=\frac{x+27}{73}+\frac{x+26}{74}\)
\(\frac{x+73}{27}+1+\frac{x+74}{26}+1=\frac{x+27}{73}+1+\frac{x+26}{74}+1\)
\(\frac{x+73+27}{27}+\frac{x+74+26}{26}=\frac{x+27+73}{73}+\frac{x+26+74}{74}\)
\(\frac{x+100}{27}+\frac{x+100}{26}=\frac{x+100}{73}+\frac{x+100}{74}\)
\(\left(x+100\right)\left(\frac{1}{27}+\frac{1}{26}-\frac{1}{73}-\frac{1}{74}\right)=0\)
mà \(\frac{1}{27}+\frac{1}{26}-\frac{1}{73}-\frac{1}{74}\ne0\)
\(\Rightarrow x+100=0\Rightarrow x=-100\)
15 x 26 + 15 x 74
\(...=15x\left(26+74\right)=15x100=1500\)
15 x 26 + 15 x 74
= 15 x (26 + 74)
= 15 x 100
= 1500
Tìm các số tự nhiên x, biết:
a) 71 - ( 33 + x) = 26
b) ( x + 73) - 26 = 74
c) ( 9 - x)3 = 216
d) 5.3x+1 = 135
a) 71 - (33 + x) = 26
33 + x = 71 - 26
33 + x = 45
x = 45 - 33
x = 12
[ ( 315 + 372 ) x 3 + ( 372 + 315 x 7 ] : ( 26 x 13 + 74 x 14 )
[ ( 315 + 372 ) x 3 + ( 372 + 315) x 7 ] : ( 26 x 13 + 74 x 14 )
= [(315 +372)(3 + 7)] : (2.13.13 + 74.7.2)
= [687.10] : [2(169 +518)]
= 6870 : [2.687]
= 6870 : 1374
= 5
tính
( 137 x 57 + 687 x 86 ) : ( 26 x 13 + 74 x 16 )
( 137 x 57 + 687 x 86 ) : ( 26 x 13 + 74 x 16 )
= ( 7809 + 59082 ) : ( 338 + 1184 )
= 66891 : 1522
= 43.94940867279895
( 137 x 57 + 687 x 86 ) : ( 26 x 13 + 74 x 16 )
= ( 7809 + 59082 ) : ( 338 + 1184 )
= 66891 : 1522
= 43.9494086728
nha Chu Thị Trà My
thực hiện phép tính hợp lí.
a) A= ( 456 x11 + 912) x 37 : 13 :74
b) B= [ ( 315 + 372 ) x 3 + ( 372 + 315) x 7]: ( 26 x 13 + 74 x 14 )
a) A= ( 5016+912).37:13:74
A= 5928.37:13:74
A=219336:13:74
A=16872:7
A=228
b) B=[687.3+687.7]:(338+1036)
B=687.(3+7):1374
B=687.10:1374
B=6870:1374
B=5
18+[x-13]=26-x+11
-[x-13+25]=99+[x-74]
Tính: [(315+372) x3 + (372 + 315) x 7] : 26 x 13 + 74 x 14=
= [ 687 x 3 + 687 x 7 ] : 26 x 13 + 74 x 14
= [ 687 x ( 3 + 7 ) ] : 26 x 13 + 74 x 14
= [ 687 x 10 ] : 26 x 13 + 74 x 14
= 6870 : 26 x 13 + 74 x 14
= 3435 + 1036
= 4471
= [ 687 x 3 + 687 x 7 ] : 26 x 13 + 74 x 14
= [ 687 x ( 3 + 7 ) ] : 26 x 13 + 74 x 14
= [ 687 x 10 ] : 26 x 13 + 74 x 14
= 6870 : 26 x 13 + 74 x 14
= 3435 + 1036
= 4471
= [ 687 x 3 + 687 x 7 ] : 26 x 13 + 74 x 14
= [ 687 x ( 3 + 7 ) ] : 26 x 13 + 74 x 14
= [ 687 x 10 ] : 26 x 13 + 74 x 14
= 6870 : 26 x 13 + 74 x 14
= 3435 + 1036
= 4471