a)8x427x3+6x573x4=24x427+24x573=24x(427+573)=24x1000=24000
b)86x27-43x54=43x2x27-43x2x27=0
c)(145x99+145)-(143x101-143)=145x(99+1)-[143x(101-1)]=145x100-143x100=14500-14300=200
d)10000-(47x72+47x2)=10000-[47x(72+2)]=10000-(47x74)=10000-3478=6522
~~~~~~HT~~~~~~
a, 10000 - 47 x 72 x 28 =
b, ( 145 x 99 + 145 ) - ( 143 x 101 - 143 ) =
c, 1002 x 9 - 18 =
d, 8 x 427 x 3 + 6 x 573 x 4 =
e, 2008 x 867 x 2009 x 133 =
Bài 3: Tính bằng cách thuận tiện
a) 10000 – 47 x 72 – 47 x 28
b) 3457 – 27 x 48 – 48 x 73 + 6543
c) (145 x 99 + 145 ) – ( 143 x 102 – 143 - 143 )
Tính nhanh :
(145 x 99 + 145) - (143 x 102 - 143 x 2) + 54 x 47 - 47 x 53 - 20 -27
Tính nhanh
(145 x 99 + 145 ) - ( 143 x 102 – 143 × 2 ) + 54 x 47 - 47 x 53 - 20 - 27
Tính nhanh (145 x 99 + 145 ) - ( 143 x 102 – 143 × 2 ) + 54 x 47 - 47 x 53 - 20 - 27
Tính nhanh
A, (145 x 99 + 145 ) - (143 x 102 -143)
B, 54 x 47 x - 47 x 53 - 20 -27
bài 1 : tính nhanh
(145 x 99 + 145) - (143 x 102 - 143)
54 x 47 - 47 x 53 - 20 - 27
2 x 8 x 50 x 25 x 125
tinh
a, 8*427*3+6*573*4
b, 6*1235*20-5*235*24
c, (145*99+145)-(143*102-143)
d, 54*47-47*53-20-27
giup mn vs
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mn can gap nhe
1. Tính bằng cách thuận tiện nhất
a) 6*1235*20-5*235*24
b) (145*99+145)-143*99-143
c) 54*47-47*53-20-27
d) 10000-47*74-47*26
e) 3457-27*48-48*73+6543
