1,993 * 199,9 = 398,4007
19,96 * 19,96 = 398,4016
vậy 1,993 * 199,9 > 19,96 * 19,96
Ta có 1,993.199,9=19,93.19,99
\(\hept{\begin{cases}19,93\cdot19,99=19,93\cdot19,96+0.03\cdot19,93\\19,96\cdot19,96=19,93\cdot19,96+0.03\cdot19,96\end{cases}}\)
Mà 19,93.0,03<19,96.0,03
Do đó\(19,93\cdot19,99< 19,96\cdot19,96\)
\(\Rightarrow1,993\cdot199,9< 19,96\cdot19,96\)
tụi bay bi ngu a 398.4007 ma lai be hon 398.4016 ha ngu vay ma cung dam di chi ng khac
1,993 * 199,9 = 398,4007
19,96 * 19,96 = 398,4016
vậy 1,993 * 199,9 > 19,96 * 19,96
chúc bn hok tốt @_@
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999998888888888888888888888888888888888796757346567869878567544535647567
1,993 x 199,9 =398,4007
19,96 x 19,26 = 370,9476
Vì 398,4007 < 370,9476
=> 1,993x199,9<19,96x19,26
00000000000000000000000000000000000000000000000000000000000099999999999994740845047837777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777955555555555555555555555559999999
Ta có :
1,993x199,9 = A 19,96x19,96 = B
( 1,993 x 10 ) x (199,9 : 10) =A 19,96 x ( 19,93 x 0,03 ) = B
19,93 x 19,99 = A 19,96 x 19,93 + 19,96 x 0,03 = B
19,93 x ( 19,96 + 0,03) =A
19,93 x 19,96 + 19,93 x 0,03 =A
Ta cùng bót ở A và B đi 19,93 x 19,96
Vì 19,93 x 0,03 < 19,96 x 0,03
Nên A < B
Vậy 1,993 x 199, 9 < 19,96 x 19,96
1,993*199,9=A
suy ra 1.993 *1000*199,9*10
A*1000*10
19,96*19,96=B
suy ra 19,96*100*19,96*100=
B*100*100
hay A * 10000=1993*1999=1993*(1996+3)
= 1993*1999+1993*3
B*10000=1996*1996=(1993+3)+1996=1993*1996+3*1996
vif 3*1996 lớn hơn 3*1993
nên B*10000 lớp hơn A*10000