Các câu hỏi tương tự
Bài 4: Tìm y
a) 100-9:(372:3.y-1)-14=83
b) 7260-120:24.y+924=528.3
c) 2000-52:(615:3:y-15)-14=1984
d) y+y.1/3+5/18=7/18
e) 13/15-(5/21+y).7/12=7/10
h) y+2.y+3.y+4.y+...+10.y=49,5
i) y.(1975/8.9+1885/9.10+1755/10.11+1579/11.12+6=1/24
1/30+1/42+1/56+1/72+1/90+1/110+1/132=21/x
B=1/30+1/42+1/56+1/72+1/90+1/110+1/132+1/156
b = 1/30 + 1/42+ 1/56+1/72+1/90+1/110+1/132+1/156
tính nhanh
1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132
Tính nhanh:
1/20 + 1/30 + 1/42 + 1/56 + 1/72 + 1/90 + 1/110 + 1/132
1/12 + 1/20 + 1/42 + 1/56 + 1/72+ 1/90 + 1/110 + 1/132
TK
15 tháng 2 2022 lúc 21:25
Tính:
41/42 + 55/56 + 71/72 + 89/90 + 109/110 + 131/132 + 155/156
MN giúp mình nha :33
Tính 1/20 + 1/30 + 1/42 + 1/56 + 1/ 72 + 1/90 + 1/110 + 1/ 132 + 1/156