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(145 x 99 + 145 ) - ( 143 x 102 – 143 × 2 ) + 54 x 47 - 47 x 53 - 20 - 27
= 145 × (99 + 1) – 143 × (102 – 2) + 47 × (54 – 53) – (20 + 27)
= 145 × 100 – 143 × 100 + 47 × 1 – 47
= 100 × (145 – 143) + (47 – 47)
= 100 × 2 + 0
= 200
= 145 x (99+1) - 143 x ( 102-2) + 47 x ( 54 - 53) -20-27
= 145 x 100 - 143 x 100 + 47 x 1 -20-27
= 100 x ( 145 - 143 ) + 47 - 20 - 27
= 200 + 47 - 20 - 27
= 200
1000 - 47 . 72 - 47 .28
= 47 . ( 1000 - 72 -28 )
= 47 .0
=0
3457 - 27 . 48 - 48 .73 + 6543
=3457 - 48 . (27 + 73 ) + 6543
= 3457 - 4800 + 6543
= 5200
(145 x 99 + 145 ) - ( 143 x 102 – 143 × 2 ) + 54 x 47 - 47 x 53 - 20 - 27
= 145 × (99 + 1) – 143 × (102 – 2) + 47 × (54 – 53) – (20 + 27)
= 145 × 100 – 143 × 100 + 47 × 1 – 47
= 100 × (145 – 143) + (47 – 47)
= 100 × 2 + 0
= 200
(145 x 99 + 145 ) - ( 143 x 102 – 143 × 2 ) + 54 x 47 - 47 x 53 - 20 - 27
= 145 × (99 + 1) – 143 × (102 – 2) + 47 × (54 – 53) – (20 + 27)
= 145 × 100 – 143 × 100 + 47 × 1 – 47
= 100 × (145 – 143) + (47 – 47)
= 100 × 2 + 0
= 200
Bài làm
Bài 1 : Tính nhanh
a) 10000 - 47x 7 -47 x 28
= 47x(10000-28)
=47x9972
=468684
b) 54x 47 - 53x 47 - 47
=47x(54-53)-47
=47x1-47
=47-47
=0
c)175 x 1274 - 175 x 273 - 175
=175x(1274-273)-175
=175x1001-175
=175175-175
=175000
# Chúc bạn học tốt #
=100000-(47.(75+24+1) b) =276.(50+36+4)
=100000-4700 =276.90
=95300 =24840
\(100000-\left(47.75+47.24+47\right)\)
\(=100000-\left(47.75+47.24+47.1\right)\)
\(=100000-\left[47.\left(75+24+1\right)\right]\)
\(=100000-47.100\)
\(=100000-47000\)
\(=53000\)
\(276.50+276.36+1104\)
\(=276.50+276.36+276.4\)
\(=276.\left(50+36+4\right)\)
\(=276.90\)
\(=24840\)