Bài 1 tính hợp lí
a) (123-37) -123. b) 126-(126-33)
c) (-224) -(34-224) d) (-53-23) -(567-23)
e) 12× (-5) ×(-2) ×(-6) f) 23×(-27) -23×73
g) (43×13) × (-3) +27×(-14-16
Bài 1 tính hợp lí
a) (123-37) -123. b) 126-(126-33)
c) (-224) -(34-224) d) (-53-23) -(567-23)
e) 12× (-5) ×(-2) ×(-6) f) 23×(-27) -23×73
g) (43×13) × (-3) +27×(-14-16
@Bơ
a.`(123-37) -123`
`=123-37-123`
`=123-123-37`
`=-37`
b.`126-(126-33)`
`=126-126+33`
`=33`
c.
` (-224) -(34-224) `
`=-224-34+224`
`=-224+224-34`
`-34`
d.
` (-53-23) -(567-23) `
`=-53-23-567+23`
`=-23+23-53-567`
`=0-620`
`=-620`
e.`12. (-5) .(-2) .(-6) `
`=12.(-60)`
`=-720`
f.
`23×(-27) -23×73`
`=621-1679`
`=-2300`
g.
` (43×13) × (-3) +27×(-14-16)`
`=43.13.(-3)+27.-30`
`=43.(-39)+(-810)`
`=-1677-810`
`=-2487`
Bài 1 :
a) (123 – 37) – 123
= 123 – 37 – 123
= 123 – 123 – 37
= 0 – 37
= – 37
b) 126 – (126 – 33)
= 126 – 126 – 33
= 0 – 33
= – 33
c) – 224 – (34 – 224)
= – 224 – 34 – 224
= – 224 – 224 – 34
= – 448 – 34
= – 482
d) (- 53 – 23) – (567 – 23)
= – 53 – 23 – 567 – 23
= – 23 – 23 – (- 53) – 567
= – 23 – 23 + 53 – 567
= – 46 + 53 – 567
= 7 – 567
= – 560
e) 12 x (-5) x (-2) x (-6) – 23 x 73
= (-5) x (-2) x 12 x (-6) – 23 x 73
= 10 x 12 x (-6) – 23 x 73
= 120 x (-6) – 23 x 73
= – 720 – 23 x 73
= – 743 x 73
= – 54 239
f) 23 x (-27) – 23 x 73
= 23 x [ (-27) – 73 ]
= 23 x – 100
= – 2 300
g) mk bí dòi
Chúc bn học tốt !!
Cho mk xin 5 sao + cảm ơn + ctrlhn nha ❤❤❤