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( 756 - 217 ) - ( 183 - 44 )
= 756 + 44 - 183 + 217
= 800 - 400
= 400
![](https://rs.olm.vn/images/avt/0.png?1311)
= 217 - 756 - 44 + 183
= ( 217 + 183 ) - ( 756 + 44 )
= 400 - 800 = -400
Tk mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
(756 - 217) - (183 -44)
=756 - 217 - 183 +44
=(756+44) - 217 - 183
=800 - (217 + 183)
=800 - 400
=400
![](https://rs.olm.vn/images/avt/0.png?1311)
tính nhanh
a, (756 - 217) - ( 183 -44)
\(=756-217-183+44\)
\(=\left(756+44\right)+\left(-217-183\right)\)
\(=800-400\)
\(=400\)
b, 11-12+13-14+15-16+17-18+19-20
\(=\left(11+19\right)-\left(12+18\right)+\left(13+17\right)-\left(14+16\right)+\left(15-20\right)\)
\(=30-30+30-30-5\)
\(=-5\)
a) \(\left(756-217\right)-\left(183-44\right)\)
= \(756-217-183+44\)
= \(\left(756+44\right)+\left(-217-183\right)\)
= \(800+\left(-400\right)\)
= \(400\)
![](https://rs.olm.vn/images/avt/0.png?1311)
124 + ( 118 - x ) = 217
118 - x = 217 - 124
118 - x = 93
x = 118 - 93
x = 25
156 - ( x + 61 ) = 82
x + 61 = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
124 + (118 -x ) = 217 156 - ( x+61) = 82
(118-x) = 217 -124 ( x +61)= 156 - 82
(118 -x)= 93 ( x +61) = 74
x = 118 - 93 x = 74 - 61
x = 25 x = 13
![](https://rs.olm.vn/images/avt/0.png?1311)
756 − 217 − 183 − 44 = 756 − 217 − 183 + 44 = 756 + 44 + − 217 − 183 = 800 + − 400 = 400.
![](https://rs.olm.vn/images/avt/0.png?1311)
(-183)x(26-17)-17x(183+26)
=-183x26-(-183x17)-17x183+17x26
=-183x26+17x26+(-183x17)-17x183
=26x(183+17)+0
=26x200
=5200
![](https://rs.olm.vn/images/avt/0.png?1311)
(325 - 47) + (175 - 53)
=325 - 47 + 175 -53
=(325 + 175 ) - (47 + 53)
= 500 - 100
= 400
b)(756-217)-(183-44)
=756-217-183+44
=(756+44)-(217+183)
=800-400
=400
=(217+183)+(344+156)
=400+500
=900
900