\(5^{56}.0,008^{19}=5^{56}.\left(0,2^3\right)^{19}=5^{56}.0,2^{57}\)=
\(5^{56}.0,2^{56}.0,2=\left(5.0,2^{56}\right).0,2=1.0,2=0,2\)
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Tính nhanh :
5^56 + 0,008^19 = ???
tinh nhanh
1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90
1) tinh nhanh
a) 85.127+5.127.3
b) 1/2 + 5/6 + 11/2 +19/20 + 29/30 + 41/42 + 55/56 + 71/72 + 89/90
3) tinh gia tri bieu thuc
a) A= 2^2 + 4^2 + 6^2+ ...+ 20^2
b) B= 1^2 + 2^2 + 3^2 +...+ 10^2
tinh tong A=1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90
Tinh tong: A=1-5/6+7/12-9/20+11/30-13/40+15/56-17/72+19/90
THUC HIEN PHEP TINH ( TINH NHANH NEU CO THE ) :
1) ( 56 x 46 - 25 x 23 ) : 23
2) ( 28 x 54 + 56 x 36 ) : 21 : 2
3) ( 76 x 34 - 19 x 64 ) : ( 38 x 9 )
4) ( 2 + 4 + 6 + .... + 100 ) x ( 36 x 333 - 108 x 111 )
5) ( 5x 411 - 3 x 165 ) : 410
6) 7256 x 4375 - 725
3650 + 4375 x 7255
tinh nhanh:
265+5*2+56*10+56
tính nhanh
1/2 + 5/6 +11/12+19/20+41/42+55/56+71/72+89/90
tính nhanh A= 1/2+5/6+11/16+19/20+29/30+41/42+55/56+71/72+89/90