Tính nhanh :
38,25-11,64-18,25+9,93+21,64
giúp mình tính bằng cách nhanh nhất nhé
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38,25 - 11,64 - 18,25 + 9,93 + 21,64
= 38,25 - 18,25 + 21,64 - 11,64 + 9,93
= 20 + 10 + 9,93
= 30 + 9,93
= 39,93
38,25-18,25+21,64-11,64+9,93
=(38,25-18,25)+(21,64-11,64)+9,93
=20+10+9,93
=30+9,93
=39,93
a,10+10+9,93
=20+9,93
=29,93
b72,9x99+72,9
=72,9x(99+1)
=72,9x100
=7290
bạn
a)15,27-4,18-2,09
=15,27-(4,18+2,09)
=15,27-6,27
=9
b)60-26,75-13,25
=60-(26,75+13,25)
=60-40
=20
c)38,25-18,25+21,64-11,64+9,93
=(38,25-18,25)+(21,64-11,64)+9,93
=20+10+9,93
=39,93
d)45+52,17-15,28-12,17
=45+(52,17-12,17)-15,28
=45+40-15,28
=69,72
e)(72,69+18,47)-(8,47+22,69)
=72,69+18,47-8,48-22,69
=(72,69-22,69)+(18,47-8,47)
=50+10
=60
A, 15,27 - 4,18 - 2,09 = 15,27 - ( 4,18 + 2,09 )
= 15,27 - 6,27
= 9
B,
60-26,75-13,25=60-(26,75+13,25)=60-40=20
C,38,25-18,25+21,64-11,64+9,93=20+10+9,93=39,93
e,(72,69+18,47)-(8,47+22,69)=72,69+18,47-8,47-22,69=72,69-22,69+18,47-8,47=50+10=60
Cau 1 13,25+21,54-4,15-14,75+3,46-0,85
=(13,25+14,75)-(21,54+3,46)+(4,15+0,85)
=28-25+5
=8
Cau 2 2024,43-24,43+1,32+5,57+4,23-11,32
=(2024,43-24,43)+(11,32-1,32)+(5,57+4,23)
=1000+10+10=120
Cau 3 38,25+0,07+21,64-18,25-11,64+9,93
=(38,25-18,25)+(0,07+9,93)+(21,64-11,64)
=20+10+10=40
38,25 - 18,25 + 21,64 - 11,64 + 9,93
= (38,25 - 18,25) + ( 21,64 - 11,64) + 9,93
= 20 + 10 + 9,93
= 30 + 9,93
= 39,93
k mình nha
Chúc bạn học giỏi
Mình cảm ơn
(^_^)
38,25-11,64-18,25+9,93+21,64
=(38,25 - 18,25) + (21,64 - 11,64) + 9,93
=20 + 10 + 9,93
=30 + 9,93
=39,93
= (38,25- 18,25) +(11,64 +21,64)+ 9,93
= 20 + 32,128 + 9,93
= 52,128 + 9,93
= 62,058