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a. 5,1 + 4,6 = 9,7
b. 7,4 – 3,1 = 4,3
c. 2,5 x 2 = 5
d. 8,8 : 4 = 2,2
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a) 8,8 : 2,5 + 7,6 : 2,5 - 6,4 : 2,5
= (8,8 + 7,6 - 6,4) : 2,5
= 10 : 2,5
= 4
\(a.\)
\(8.8:2.5+7.6:2.5-6.4:2.5\)
\(=\left(8.8+7.6-6.4\right):2.5\)
\(=10:2.5\)
\(=4\)
\(b.\)
\(0.25\times1200+125\times1.5\times2-250\times2.6\)
\(=250\times1.2+250\times1.5-250\times2.6\)
\(=250\times\left(1.2+1.5-2.6\right)\)
\(=250\times0.1=25\)
\(c.\)
\(\left(32\times11-3200\times0.1-32\right):\left(81.6\times27.3-17.3\times81.6\right)\)
\(=\left[32\times\left(11-10-1\right)\right]:\left[81.6\times\left(27.3-17.3\right)\right]\)
\(=0\)
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65.5 - 25.5 x X = 34.5 X x 8.8 - 10.5 = 21 : 42 ( 3.3 - X ) x 7.2 + 18
40 x X = 34.5 X x 8.8 - 10.5 = 0.5 sai đề !
X = 34.5 : 40 X x 8.8 = 0.5 + 10.5
X = 0.8625 X x 8.8 = 11
X = 11 : 8.8
X = 1.25
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a,x-(3,3+2,5)=8,8
x-5,8=8,8
x=8,8+5,8
x=14,6
b,19,47-x=2,073+6,9
19,47-x=8,973
x=19,47-8,973
x=10,497
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tìm x :
x - 36,18 = 44,77
x = 44,77 + 36,18
x = 80,95
x - 3,5 = 4,6 + 2,1
x - 3,5 = 6,7
x = 6,7 + 3,5
x = 10,2
x - ( 3,3 + 2,5 ) = 8,8
x - 5,8 = 8,8
x = 8,8 + 5,8
x = 15,6
x - 2,7 = 3,3 = 9
3,3 = 9 là sao bạn ??
K NHÁ =))
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\(a,x\times15-12,3\times x=81\)
\(x\times\left(15-12,3\right)=81\)
\(x\times2,7=81\)
\(x=80:2,7\)
\(x=30.\)
\(b,x:2,5-4,4=3,8\)
\(x:2,5=3,8+4,4\)
\(x:2,5=8,2\)
\(x=8,2\times2,5\)
\(x=20,5.\)
\(c,37-x+21,5=35,8\)
\(37-x=35,8-21,5\)
\(37-x=14,3\)
\(x=37-14,3\)
\(x=22,7.\)
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1,1+ 2,2+ 3,3+ 4,4+ 5,5+ 6,6+ 7,7+ 8,8+ 9,9
= 49.5
bài kì zạ !
hok tốt !
cool
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Nhớ tích cho mink nhéeeeeee,
=(1,1+9,9)+(2,2+8,8)+(3,3+7,7)+(4,4+6,6)+5,5
=11+11+11+11+5,5
=49,5
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tính nhanh:
1,1+2,2+3,3+4,4+5,5+6,6+7,7+8,8+9,9
=(1,1+9,9)+(2,2+8,8)+(3,3+7,7)+(4,4+6,6)+5,5
=11+11+11+11+5,5
=22+11+11+5,5
=33+11+5,5
=44+5,5
=49,5
3 bạn nhanh và đúng nhất nhé
bằng 0
#Forever