9.|40-37| - |2.13-52|
Thực hiện phép tính ( tính nhanh nếu có thể)
a) 9.|40-37|-|2.13-52|
b) 125(28+72)-25(32.4+64)
a)=9*3-26
=27-26
=1
b)=125*100-25*100
=12500-2500
=10000
-84:4+39.37+50
9.|40-37|-|2.13-52|
mai mk phải nộp bài rùi !
-84:4+39.37+50
=-12+1443+50
=1481
9.|40-37|-|2.13-52|
=9.l3l-l-26l
=9.3-26
=1
-84:4+39.37+50
=-84:4+316+1
=-21+316+1
=-21+43046721+1
=43046700+1=43046701
9.|40-37|-|2.13-52|
=9.|3|-|-26|
=9.3-26
=27-26=1
ℓ. 500 – {5[409 – (2³.3 – 21)²] + 10³} : 15 m. 67 – [8 + 7.3² – 24 : 6 + (9 – 7)³] : 15
n. (–23) + 13 + (–17) + 57 o. (–123) + |–13| + (–7) p. |–10| + |45| + (–|–455|) + |–750|
q. –|–33| + (–15) + 20 – |45 – 40| – 57. h. 9.|40 – 37| – |2.13 – 52|
ℓ. 500 – {5[409 – (2³.3 – 21)²] + 10³} : 15
= 500 - {5[409-(8.3-21)2]+103}:15
= 500-{5[409-(24-21)2]+1000}:15
= 500-{5[409-32]+1000}:15
= 500-{5[409-9]+1000}:15
= 500-{[5.400]+1000}:15
= 500-{2000+1000}:15
= 500-3000:15
= 500-200
= 300
m. 67 – [8 + 7.3² – 24 : 6 + (9 – 7)³] : 15
= 67 – [8 + 7.9 – 4 + 23] : 15
= 67 – [8 + 63 – 4 + 8] : 15
= 67 – [71 – 4 + 8] : 15
= 67 – [67 + 8] : 15
= 67 – 75 : 15
= 67 – 5
= 62
n. (–23) + 13 + (–17) + 57
= (–10) + [(–17) + 57]
= (–10) + 40
= 30
o. (–123) + |–13| + (–7)
= [(–123) + (–7)] + |–13|
= (–130) + 13
= (–117)
p. |–10| + |45| + (–|–455|) + |–750|
= 10 + 45 + (–455) + 750
= (10 + 45 + 750) + (–455)
= 805 + (–455)
= 350
q. –|–33| + (–15) + 20 – |45 – 40| – 57 = (–33) + (–15) + 20 – |5| – 57 = (–48) + (20 + 5 + 57) = (–48) + 82 = 34 h. 9.|40 – 37| – |2.13 – 52| = 9.|3| – |26 – 52| = 9.3 – |–26| = 27 – 26 = 19*|37-40|-3*|-52+43|
i) 10^2-60:(5^6:5^4-3.5)
j)2345-1000:[19-2(21-18)^2]
k)205-[1200-(4^2-2.3)^3]:40
l)500-{5[409-(2^3.3-21)^2]+10^3}:15
n)(-23)+13+(-17)+57
o)(-123)+ -13+(-7)
p)-10+45+ (- -455) + -750
h)9.40-37-2.13-52
/40-37/-/13-52/
Ta có: |40 - 37| - |13 - 52|
= 3 - 39
= -36
/40-37/-/13-52/
|40 - 37| - |13 - 52|
= 3 - 39
= -36
a,(-123)+|-13|+(-7)
b,-|-33|+(-15)+20-|45-40|-57
c,9.|40-37|_2.13-52|
d,12+15+18+...+90
e,140:{80-[130-(12-4)^2]}
giúp mk với
\(\text{(-123) +|–13| +(-7)}\)
\(\text{= (-123) + 13 + (-7)}\)
\(\text{= (-110) + (-7)}\)
\(=\text{(-117)}\)
b
Tính quý giá biểu thức
a) 2 + 4 + 6 + 8 +… + 34 + 36 + 38 + 40
b) 3 + 5 + 7 + … + 35 + 37 + 39 + 41
c) 3 + 6 + 9 + 12 + … + 45 + 48 + 51
d) 4 + 8 + 12 + 16 + … + 40 + 44 + 48 + 52
a: Số số hạng là:
(40-2):2+1=20(số)
Tổng là:
\(\dfrac{42\cdot20}{2}=42\cdot10=420\)