cac ban giup mk nha hua vote 5 sao
1.tinh nhanh
42×67+42×32+42
26×31+26×16+47×74
2.tinh gia tri bieu thuc
6012:12+4x31x250-8x19x125
cac ban giup mk nha hua vote 5 sao
1.tinh nhanh
42×67+42×32+42
26×31+26×16+47×74
2.tinh gia tri bieu thuc
6012:12+4x31x250-8x19x125
Đáp án: `1) 4200 ; 4700`
`2) 12501`
Giải thích các bước giải:
`1)`
$\text { a, 42 x 67 + 42 x 32 + 42 }$
$\text { = 42 x ( 67 + 32 + 1 ) }$
$\text { = 42 x 100 }$
$\text { = 4200 }$
$\text { b, 26 x 31 + 26 x 16 + 47 x 74 }$
$\text { = 26 x ( 31 + 16 ) + 47 x 74 }$
$\text { = 26 x 47 + 47 x 74 }$
$\text { = 47 x ( 26 + 74 ) }$
$\text { = 47 x 100 }$
$\text { = 4700 }$
`2)`
$\text { 6012 : 12 + 4 x 31 x 250 – 8 x 19 x 125 }$
$\text { = 501 + 1000 x 31 – 1000 x 19 }$
$\text { = 501 + 1000 x ( 31 – 19 ) }$
$\text { = 501 + 1000 x 12 }$
$\text { = 501 + 12000 }$
$\text { = 12501 }$
1.tinh nhanh
42×67+42×32+42
= 42 × ( 67 + 32 + 1 )
= 42 × 100
= 4200
26×31+26×16+47×74
= 26 × ( 31+ 16 ) +47×74
= 26 × 47 +47×74
= 47 × ( 26 + 74 )
= 47 × 100
= 4700
2.tinh gia tri bieu thuc
6012 : 12+4 x 31 x 250-8 x 19 x 125
= 501 + 124 × 250 – 152×125
= 501+ 35500 – 19000
= 36001 – 19000
= 17001