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a)4,75x3,9+4,75x2,7+4,75x3,4=4,75x(3,9+2,7+3,4)=4,75x10=47,5
a) 4,75 x 3,9 + 4,75 x 2,7 + 4,75 x 3,4
= 4,75 x ( 3,9 + 2,7 + 3,4 )
= 4,75 x 10
= 47,5
b)10,05 x 15,7 – 10,05 x 4,7 – 10,05
= 10,05 x 15,7 – 10,05 x 4,7 – 10,05 x 1
= 10,05 x ( 15,7 - 4,7 - 1 )
= 10,05 x 100,5
c) 8,23 + 9,38+ 10,53 +11,68 +12,83 +13,98
= ( 8,23+13,98 ) + ( 9,38+12,83 ) + ( 10,53+11,68 )
= 22,21 + 22,21 + 22,21
= 66,63
3+15+7+29+5+12+21+35+47+38+42+8+1+45+49+43
=(3+47)+(5+45)+(7+43)+(29+21)+(12+38)+(15+35)+(1+49)+(8+42)
= 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50
=50*8 = 400
14,35 × 63 + 14,35 × 36 + 14,35
= 14,35 x 63 + 14,35 x 36 + 14,35 x 1
= 14,35 x ( 63 + 36 + 1 )
= 14,56 x 100
= 1456
\(14,35\times63+14,35\times36+14,35\)
\(=14,35\times\left(63+36+1\right)\)
\(=14,35\times100\)
\(=1435\)
\(\left(42,8\cdot6,9-154,56\right):34,5\)
\(=\left(295,32-154,56\right):34,5\)
\(=\frac{107}{56}:34,5\)
\(=\frac{107}{1932}=0,05...\)
Hc tốt #
\(\left(42,8\times6,9-154,56\right):34,5\)
\(=\left(295,32-154,56\right):34,5\)
\(=140,76:34,5\)
\(=4,08\)
\(1,6.96+3,2.2\)\(=1,6.96+1,6.2.2\)
\(=1,6.96+1,6.4\)
\(=1,6.\left(96+4\right)\)
\(=1,6.100=160\)
4,3 * 6,5 + 2,15 * 37 + 2,15 * 27 - 2,15
= 2,15 * 13 + 2,15 * 37 + 2,15 * 27 - 2,15
= 2,15 * ( 13 + 37 + 27 - 1 )
= 2,15 * 76
= sai đề
a) \(18,71-9,24+16,29-6,76\)
\(=\left(18,71+16,29\right)-9,24-6,76\)
\(=\left(18,71+16,29\right)-\left(9,24+6,76\right)\)
\(=35-16=19\)
b) \(25,75+24,36-35,75\)
\(=25,75+24,36-\left(25,75+10\right)\)
\(=25,75+24,36-25,75-10\)
\(=\left(25,75-25,75\right)+\left(24,36-10\right)\)
\(=0+14,36=14,36\)
a) 18,71 - 9,24 +16,29 -6,76
= (18,71 + 16,29) - (9,24 +6,76)
= 35 - 16
= 19
b) 25,75 + 24,36 -35,75
= 25,75 + 24,36 - ( 25,75 + 10)
= 25 ,75 + 24,36 - 25,75 - 10
= (25,75 - 25,75 ) + ( 24,36 -10 )
= 0 +14,36
= 14,36
Sửa đề: 20,12*35+2,012*250+201,2*3,9+20,12
=20,12*(35+25)+20,12(39+1)
=20,12*60+20,12*40
=20,12*100=2012
=20,12*(35+25)+20,12(39+1)
=20,12*60+20,12*40
=20,12*100=2012