Toán Lớp 5: tính bằng cách thuận tiện
0,25×611,7×40
6’28×18,24+18,24×3,72
36,4×101-36,4×1
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Toán Lớp 5: tính bằng cách thuận tiện
0,25×611,7×40
6’28×18,24+18,24×3,72
36,4×101-36,4×1
Comments ( 2 )
0,25 × 611,7 × 40
= ( 0,25 × 40 ) × 611,7
= 10 × 611,7
$\text{= 6117}$
6,28 × 18,24 + 18,24 × 3,72
= ( 6,28 + 3,72 ) × 18,24
= 10 × 18,24
$\text{= 182,4}$
36,4 × 101 – 36,4 × 1
= 36,4 × ( 101 – 1 )
= 36,4 × 100
$\text{= 3640}$
$\text{@dautay17747}$
0,25xx611,7xx40
=(0,25xx40)xx611,7
=10xx611,7
=6117
6,28xx18,24+18,24xx3,72
=18,24xx(6,28+3,72)
=18,24xx10
=182,4
36,4xx101-36,4xx1
=36,4xx(101-1)
=36,4xx100
=3640
\text{# Mạc}