Các câu hỏi tương tự
Tính hợp lý:(hoặc rút gọn)
C=(530.749.45-4924.12510.28):(529.162.748)
bai 1, tim x, biet
a, (-x+31)-39=-69 b, -120-(-30-x)=-50 c, /x/ -5=-1 d, /x+2/-12=-1
e, \(\left(3x-2^4\right).7^3=2.7^5\)
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khi chia so nguyen a cho 3 thi du 2 .Chia 8 thi du 4 .hoi so du khi chua a cho 48 du bao nhieu
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tinh gia tri cua bieu thuc
(24.52.112.7):(23.53.72.11)
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ai nhanh minh tich nha
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a) 92/9 + 13/5 - 56/9
b) 58/7 - (31/9 + 30/7)
c) 2/3 + 1/3 x 9/4 - 13/12
d) 41/8 - 7/4 : 11/5
e) 478/19 : 5/4 - 668/19 : 5/4
f) 32/21 x 49/45 : 16/22 x 15/33
g) 2020x2018+9 / 2019x2020-2011.
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1+(-6)+2+(-7)+3+(-8)+...+15+(-20)
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cho S1=1+2
S2=3+4+5
S3=6+7+8+9
..........
tinh sao
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CMR n=2.3.4.5.6. CTR cac so sau n+2;n+3;n+4;n+5;n+6;n+7 la hop so
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-1+3-5+7....+97-99
1+2-3-4+...+97+98-99-100
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