Toán Lớp 6: bỏ dấu ngoặc r tính
a.-13+(-750)+(-17)+750
b.(35-17)+(17+120-35)
c.(55+45+15)-(15-55+45)
d.-(12+21-23)-(23-21+10)
e.235-(34+135)-100
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 6: bỏ dấu ngoặc r tính
a.-13+(-750)+(-17)+750
b.(35-17)+(17+120-35)
c.(55+45+15)-(15-55+45)
d.-(12+21-23)-(23-21+10)
e.235-(34+135)-100
Comments ( 2 )
a ) − 13 + ( − 750 ) + ( − 17 ) + 750
= − 13 − 750 − 17 + 750
= − 13 − 17 − 750 + 750
= − 30
b ) ( 35 − 17 ) + ( 17 + 120 − 35 )
= 35 − 17 + 17 + 120 − 35
= ( 35 − 35 ) + ( − 17 + 17 ) + 120
= 0 + 0 + 120
= 120
c ) ( 55 + 45 + 15 ) − ( 15 − 55 + 45 )
= 55 + 45 + 15 − 15 + 55 − 45
= 55 + 55 + ( 15 − 15 ) + ( 45 − 45 )
= 110 + 0 + 0
= 110
d ) − ( 12 + 21 − 23 ) − ( 23 − 21 + 10 )
= − 12 − 21 + 23 − 23 + 21 − 10
= ( − 12 − 10 ) + ( − 21 + 21 ) + ( 23 − 23 )
= − 22 + 0 + 0
= − 22
e ) 235 − ( 34 + 135 ) − 100
= 235 − 34 − 135 − 100
= 235 − 34 − ( 135 + 100 )
= 235 − 34 − 235
= 235 − 235 − 34
= 0 − 34
= − 34
a) -13 + (-750) + (-17) + 750
= -13 – 750 – 17 + 750
= -13 – 17 – 750 + 750
= -30
b) (35 – 17) + (17 + 120 – 35)
= 35 – 17 + 17 + 120 – 35
= (35 – 35) + (-17 + 17) + 120
= 0 + 0 + 120
= 120
c) (55 + 45 + 15) – (15 – 55 + 45)
= 55 + 45 + 15 – 15 + 55 – 45
= 55 + 55 + (15 – 15) + (45 – 45)
= 110 + 0 + 0
= 110
d) -(12 + 21 – 23) – (23 – 21 + 10)
= -12 – 21 + 23 – 23 + 21 – 10
= (-12 – 10) + (-21 + 21) + (23 – 23)
= -22 + 0 + 0
= -22
e) 235 – (34 + 135) – 100
= 235 – 34 – 135 – 100
= 235 – 34 – (135 + 100)
= 235 – 34 – 235
= 235 – 235 – 34
= 0 – 34
= -34