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= ( 7 + 0,29 + 9 + 0,34 + 8 + 0,27 ) - ( 7 + 0,34 + 6 + 0,27 + 5 + 0,29 )
= 7 + 0,29 + 9 + 0,34 + 8 + 0,27 - 7 - 0,34 - 6 - 0,27 - 5 - 0,29
= ( 7 - 7 ) + ( 0,29 - 0,29 ) + ( 9 - 6 ) + ( 0,34 - 0,34 ) + ( 8 - 5 )+ ( 0,27 - 0,27 )
= 0 + 0 + 3 + 0 + 3 + 0
= 6 .
50 - 51 + 40 -41 + 30 -31 + 60
= ( 50 - 41 ) + ( 40 - 31 ) +( 60 - 51 ) + 30
= 9 + 9 + 9 + 30
= 9 x 4 + 30
= 36 + 30
= 66
Hok tốt !!
50-51+40-41+30-31+60
=-1+(-1)+(-1)+60
=-3+60
=57
\(\text{50-51+40-41+30-31+60}\)
\(\text{=(50+40+30+60)+(−51−41−31)}\)
\(\text{=180−123}\)
\(\text{=57}\)
chúc bạn học tốt
{70-61}+{60-51}+{50-41}+{40-31}+{30-21}+{20-11}+10=9+9+9+9+9+9+10=64
a) ( 200 - 58 ) x 58 + ( 100 + 42 ) x 42
= 142 x 58 + 142 x 42
= 142 x ( 58 + 42 )
= 142 x 100
= 14200
b) 50 - 51 + 40 - 41 + 30 - 31 + 60
= ( 50 + 40 + 30 ) - ( 51 + 41 + 31 ) + 60
= 120 - 123 + 60
= -3 + 60
= 57
caau b ko chắc
c) 28 + 62 x a x ( a x1 trừ a : 1 ) cộng 28 x 8 cộng
= 28 + 62a x 0 + 28 x 8
= 28 x 1 + 0 + 28 x 8
= 28 x ( 1 + 8 )
= 28 x 9
= 252
a) \(\left(7,29+9,34+8,27\right)-\left(7,34+6,27+5,29\right)\)
\(=\left(7,29-5,29\right)+\left(9,34-7,34\right)+\left(8,27-6,27\right)\)
\(=2+2+2\)
\(=6\)
b ) \(45,7\times101-45,7\)
\(=45,7\times101-45,7\times1\)
\(=45,7\times\left(101-1\right)\)
\(=45,7\times100\)
\(=457\)
c ) \(50-51+40-41+30-31+60\)
\(=\left(60-51\right)+\left(50-41\right)+\left(40-31\right)+30\)
\(=9+9+9+30\)
\(=57\)
d ) \(28+62\times a\times\left(a\times1-a\div1\right)+28\times8+28\)
\(=28+62\times a\times\left(a-a\right)+28\times8+28\times1\)
\(=28\times1+62\times a\times0+28\times8+28\times1\)
\(=28\times1+0+28\times8+28\times1\)
\(=28\times\left(8+1+1\right)\)
\(=280\)
\(a,7.29+9.34+8.27-7.34-6.27+5.29\)
\(=2+2+2=6\)
\(b,45.7x101-45.7x1\)
\(=45.7x\left(101-1\right)\)
\(=45.7x100=4570\)
\(c,50+40+30+60-51-41-31\)
\(=180-51-41-31\)
\(=129-41-31=88-31=57\)
b) \(\left(7,29+9,34+8,27\right)-\left(7,34+6,27+5,29\right)\)
\(=\left(7,29-5,29\right)+\left(9,34-7,34\right)+\left(8,27-6,27\right)\)
\(=2+2+2=6\)
50-51+40-42+30-31+60=56
(7,29+9,34+8,27)-(7,34+6,27+5,29)
= 24,9 - 18,9
=43,8