Tính nhanh :
a ) 125 – ( – 75 ) + 32 – ( 48 + 32 )
b ) 3. ( – 4 )^2 + 2 . ( – 5 ) – 20
c ) ( – 4 – 8 ) . ( – 12 + 9 )
d ) [ 93 – ( 20 – 7 ) ] : 16
e ) 4 . 5^2 – 3( 24 – 9 )
g ) 48 – 6( 8 – 24 )
h ) – 564 + [ ( – 724 ) + 564 + 224 ]
Tính nhanh : a ) 125 – ( – 75 ) + 32 – ( 48 + 32 ) b ) 3. ( – 4 )^2 + 2 . ( – 5 ) – 20 c ) ( – 4 – 8 ) . ( – 12 + 9 ) d ) [ 93 – ( 20 – 7 ) ] : 16 e )
By Athena
a. 125-(-75)+32-(48+32)
=125+75+32-48-32
=(125+75)+(32-32)-48
=200+0-48
=152
b. 3.(-4)²+2.(-5)-20
=3.16-10-20
=48-30
=18
c. (-4-8).(-12+9)
=-12.(-12+9)
=(-12).(-12)+(-12).9
=144+(-108)
=36
d. [93-(20-7)]:16
=[93-20+7]:16
=[100-20]:16
=80:16
=5
e. 4.5²-3.(24-9)
=4.25-3.15
=100-45
=55
g. 48-6(8-24)
=48-6.8+6.24
=48-48+144
=144
h. -564+[(-724)+564+224]
=-564-724+564+224
=(-564+564)+(-724+224)
=0-500
=-500
a, 125-(-75)+32-(48+32)
=125+75+32-48-32
=(125+75)+(32-32)-48
=200+0-48
=152
b, 3.(-4)²+2.(-5)-20
=3.16-10-20
=48-30
=18
c, (-4-8).(-12+9)
=-12.(-12+9)
=(-12).(-12)+(-12).9
=144+(-108)
=36
d, [93-(20-7)]:16
=[93-20+7]:16
=[100-20]:16
=80:16
=5
e, 4.5²-3.(24-9)
=4.25-3.15
=100-45
=55
g, 48-6(8-24)
=48-6.8+6.24
=48-48+144
=144
h, -564+[(-724)+564+224]
=-564-724+564+224
=(-564+564)+(-724+224)
=0-500
=-500