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1.73.(8-59)-59.(8-73)
=73.8-73.59-59.8-59.73
=73.(59-59)-8.(73-59)
=73.0-8.14
=0-112
=-112
2.159.(18-59)-59.(18 - 159)
=159.18-59.159-59.18-59.159
=159.(59-59)-18.(159-59)
=159.0-18.100
=0-1800
=-1800
A\(-73+\left(25-49+73\right)-\left(35-59\right)\)
\(=-73+\left(-24+73\right)-\left(-24\right)\)
\(=-73+49-\left(-24\right)\)
\(=-24-\left(-24\right)=0\)
B\(\left(-145+33\right)-\left(33-145\right)-17\)
\(=-112-\left(-112\right)-17=0-17=-17\)
1: \(=-145\cdot13+145\cdot57+57\cdot10-57\cdot145=-1315\)
2: \(=17\cdot15-17\cdot16+16\cdot17-16\cdot20=255-320=-65\)
3: \(=-38\cdot25+38\cdot4-25\cdot4+25\cdot38=13\cdot4=52\)
4: \(=23\cdot145-23\cdot17-145\cdot23+145\cdot6=479\)
5: \(=24\cdot15-24\cdot4+4\cdot24-4\cdot15=360-60=300\)
6: \(=199\left(15-17+17-5\right)=199\cdot10=1990\)
7: \(=-39\cdot5+39\cdot99+99\cdot10-99\cdot39=795\)
a) \(\left(-25\right).5.\left(-4\right).2\)
\(=\left[\left(-25\right).\left(-4\right)\right].\left(2.5\right)\)
\(=100.10=1000\)
b) \(\left(-456\right)-\left(67-456\right)\)
\(=-456-67+456\)
\(=\left(456-456\right)-67\)
\(=67\)
1.tính hợp lí
-16+24+16-34
=(-16+16)+(24-34)
=0+(-10)
=-10
25+37-48-25-37
=(25-25)+(37-37)-48
=0+0-48
=-48
2575+37-2576-29
=(2575-2576)+(37-29)
=-1+8
=7
34+35+36+37-14-15-16-17
=(34-14)+(35-15)+(36-16)+(37-17)
=20+20+20+20
=20.4
=80
2.bỏ ngoặc rồi tính
-7264+(1543+7264)
=-7264+1543+7264
=(-7264+7264)+1543
=0+1543
=1543
(144-97)-144
=144-97-144
=(144-144)-97
=0-97
=-97
(-145)-(18-145)
=-145-18+145
=(-145+145)-18
=0-18
=-18
a, (-25) + 276 - (276 - 25)
= (-25) + 276 - 276 + 25
= [ (-25) + 25] - (276 - 276)
= 0 - 0
= 0
b, 24 x 46 + 24 x 53 + 24
= 24 x ( 46 + 53 + 1)
= 24 x 100
= 2400
(-145) + [25 + (-25)] - (-145) + 15 + (-35)
= (-145 + 145) + 0 - 20
= 0 - 20
= -20
(-145)+(-25+25)-(-145)+15+(-35)
=(-145+145)+(-25+25)+(-35+15)
= 0 + 0 +(-20)
= -20