245 + 52x = 870
52x = 870 - 245
52x = 625
52x = 54
=> 2x = 4
=> x=2
245+5^2x=870 \(\leftrightarrow\) 5^2x= 870-245 \(\leftrightarrow\) 5^2x=625 \(\leftrightarrow\) x=625/ 25 \(\leftrightarrow\) x=25
-5/2x-3=3-2x/245
(870-1.2)(870-2.3)(870-3.4)...(870-99.100)=
tìm x thuộc Z:
6(x-23)-5(x+12)=-(-245)
-3(32-2x)+4(-17-2x)=-38
bài 5 tính nhanh
a, 1990 .1990 - 1992 . 1988
b, ( 1374 . 57 + 687 .86) : ( 870+235.122)
c, ( 124.237 +152 ) : ( 870+235.122)
d, 423134 . 846267 - 423133/ 846267 . 423133 + 423134
#Toán lớp 6(870-1.2).(870-2.3).(870-3.4).....(870-99.100)
Ai nhanh nhất mình tick cho.
-126-(4^2-5)^2+|-870|:29
tìm x thuộc Z
2x-{234-[-456+(-543-3x)]}=23
6(x-23)-5(x+12)=-(-245)
5(3-2x) 5(4-x)=6-4x
-5(2-x)+4(x-3)=10x-15
-7(5-x)-2(x-10)=15
-4(x+1)+89x-3)=24
5(x-30-2(x+6)=9
help,cần gấp
Tìm x, biết
a) 2 4 5 + 50 : 2 3 x = − 51
b) 4 1 2 − 2 x .1 4 61 = 6 1 2
\(A=6.25-\left(61-17\right).12+\left(27+24\right):17\)
\(B=\left(-126\right)-\left(4^2-5^2\right)+870:29\)
\(7^2.5-\left(2x+1\right)=630:9\)\(\)
\(\left(12-4x\right)+120:23=17\)
