tinh nhanh a)1011-(-81)+219-(-700) b) 100-(4x52-3x23)
tính nhanh
1011-(-81)+219-(-700)
\(=1011+81+219+700\)
\(=1011+219+81+700\)
\(=1230+81+700\)
\(=2011\)
1011 - (-81) + 219 - (-700)
= 1011 + 81 + 219 + 700
= 1011 + (81 + 219 + 700)
= 1011 + (300 + 700)
= 1011 + 1000
= 2011
1011-(-81)+219-(-700)
= 1011+81+219+700
=(81+219)+(1011+700)
=300+1711= 2011
k đúng cho mình nhé
Tinh nhanh
4x52+81:3\(^2\)-(13-4)\(^2\)
4x 52 + 81:32 - (13-4)2
= 208 + 81:9- 92
= 208 + 9 - 81
= 217 - 81
=136
Số 7 có thể viết thành phân số là :
A. 7/10
B. 700/700
C. 700/100
D. 100/700
làm nhanh giùm với !!!
\(7=\dfrac{7}{1}=\dfrac{7\cdot100}{1\cdot100}=\dfrac{700}{100}\\ =>C\)
100+ 200+ 30 +300+70+700+800+900: 9 ( tinh nhanh)
100+200+30+300+70+700+800+900:9
=100+200+30+300+70+700+800+100
=(100+200+300+700+800+100)+(30+70)
=2300
=100+200+30+300+70+700+800+100
=(100+100)+(200+800)+(30+70)+(300+700)
=200+1000+100+1000
=2300
Tinh nhanh:
a) 4.51.7+2.86.7+12.2.7
b) 237 +301+183+219
a)
4 . 5 . 7 + 2 . 86 . 7 + 12 . 2 . 7
= 20 . 7 + 172 . 7 + 24 . 7
= 7 . (20 + 172 + 24)
= 7 . 216
= 1512
b)
237 + 301 + 183 + 219
= (237 + 183) + (301 + 219)
= 420 + 520
= 940
k mk nha DuongthiHongDuyen !
tinh nhanh
a)25*100+75*101
b)729+2995
c)325*48
d)1+5+9+13+17+...+81+85
e)B=1*2+2*3+3*4+4*5+...+99*100
Tính nhanh:
a)314:25+86:25
b)724:4-24:4
c)(700+21):7
d)(819-81):9 nhanh mk tick
Ta có :
A)314:25+86:25
= (314+86):25
=400:25
= 16
B)724:4-24:4
=(724-24):4
=700:4
=175
c)(700+21):7
=700+(21:7)
=700+3
=703
d)(819-81):9
=819-(81:9)
=819-9
=810
Tính nhanh
a)314:25+86:25
b)724:4-24:4
c)(700+21):7
d)(819-81):9
a)314:25+86:25
= (314+86):25
=400:25
=16
b) 724:4-24:4
=(724-24):4
= 700:4
=175
c)(700+21):7
= 700:7+21:7
= 100+3
= 103
d)(819-81):9
= 819:9-81:9
= 81 - 9
= 72
GOOD LUCK !!!
Tinh nhanh (319-79)-(219-21)