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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
a)
=9,85.(25,82-12,32-3,5)
=9,85.10
=98,5.
b)
=5/4.1/4.4.4/5.1/4.6/5
=3/40.
a) 46 : 24 + 8 : 24
= (46 + 8) : 24
= 54 : 24
= 2,25
b) 705 : 45 - 336 : 45
= (705 - 336) : 45
= 369 : 45
= 8,2
c) 23,45 : 12,5 : 0,8
= 2,345
d) 666 x 3,76 - 333 x 6,52
= 333 x 2 x 3,76 - 333 x 6,52
= 333 x 7,52 - 333 - 6,52
= 333 x (7,52 - 6,52)
= 333 x 1
= 333
a)46:24+8:24=(46+8):24
=54:24
=2,25
b)705:45-336:45=(705-336):45
=369:45
=8,2
c)23,45:12,5:0,8=23,45:(12,5x0,8)
=23,45:10
=2,345
d)666x3,76-333x6,52=666x3,76-333x2x3,26
=666x3,76-666x3,26
=666x(3,76-3,26)
=666x0,5
=333
e)168x0,125+16:8=8x21x0,125+16:8
=21x(8x0,125)+2
=21x1+2
=21+2
=23
a)a, 46:24+8:24= ( 46+8):24. = 54:24. =2 ( dư 6)
b, 705:45-336:45=
15,6 : 2,4 + 15,6 : 6,6 + 15,6
= 15,6 : (2,4 + 6,6 + 1)
= 15,6 : 10
= 1,56
\(15,6\div2,4+15,6\div6,6+15,6\)
\(=15,6\div\left(2,4+6,6+1\right)\)
\(=15,6\div10\)
\(=1,56\)
\(1,6.96+3,2.2\)\(=1,6.96+1,6.2.2\)
\(=1,6.96+1,6.4\)
\(=1,6.\left(96+4\right)\)
\(=1,6.100=160\)
7/9 + 2/3 + 2/9 + 1
= (7/9 + 2/9) + 1 + 2/3
= 1 + 1 + 2/3
= 2 + 2/3
= 8/3
a. 18,71 + 16,29 - ( 9,24 + 6,76 ) = 18,71 + 16,29 - 16 = 18,71 + 0,29 = 19
a,18,71-9,24+16,29-6,7
=(18,71-9,24)+(16,29-6,7)
=9,47+9,59
=19,06
b,25,75+24,36-35,75
=(35,75+25,75)+24,36
=61,5+24,36
=85,86
c,2,5 x 12,5 x 0,8 x 4
=(2,5 x 4) x (12,5 x 0,8)
=10 x 10
=100
d,0,125x0,6x8
=(0,125x8)x0,6
=1x0,6
=0,6