Tính nhanh :
a) 64 x 25 + 35 x 25 + 25
b) 58 x 42 + 32 x 8 + 5 x 16
c) (42 x 43 + 57 x 43 + 43) – 360 : 4
d) 456 : 2 x 181 456 : 3 – 102
Tính nhanh :
a) 64 x 25 + 35 x 25 + 25
b) 58 x 42 + 32 x 8 + 5 x 16
c) (42 x 43 + 57 x 43 + 43) – 360 : 4
d) 456 : 2 x 181 456 : 3 – 102
@Gaumatyuki#.
$a)$ $64×25+35×25+25.$
$=$ $64×25+35×25+25×1$
$=$ $25×(64+35+1).$
$=$ $25×1000.$
$=$ $2500.$
$b)$ $58×42+32×8+5×16.$
$=$ $2436+256+80$.
$=$ $2772.$
$c)$ $(42×43+57×43+43)-360÷4.$
$=$ $42×43+57×43+43×1-90.$
$=$ $43×(42+57+1)-90.$
$=$ $43×100-90.$
$=$ $4300-90.$
$=$ $4210.$
$d)$ $456÷2×181456÷3-102.$
$=$ $228÷3×181456-102.$
$=$ $76×181456-102.$
$=$ $13790656-102.$
$=$ $13790554.$
a) 64 x 25 + 35 x 25 + 25
= (64 + 35 + 1) x 25
= 100 x 25
= 2500
Câu b là 58 thì k tính đc, mình sửa thành 48 nha
b) 48 x 42 + 32 x 8 + 5 x 16
= 16 x 126 + 16 x 16 + 16 x 5
= 16 x (126 + 16 + 5)
= 16 x 147
= 2352
c) (42 x 43 + 57 x 43 + 43) – 360 : 4
= 43 x (42 + 57 + 1) – 90
= 43 x 100 – 90
= 4300 – 90
= 4310
d) 456 : 2 x 181 + 456 : 3 x 102
= 456 : (2 x 181 + 3 x 102)
= 456 : (362 + 306)
= 456 : 56
= 57/7
Cho mình trả lời hay nhất nha