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\(-16+24+16-34=\left(24-34\right)+\left(16-16\right)=-10\\ 25+37-48-25-37=\left(25-25\right)+\left(37-37\right)-48=-48\\ 2575+37-2576-29=\left(2575-2576\right)+\left(37-29\right)=-1+6=5\\ 34+35+36+37-14-15-16-17=\left(34-14\right)+\left(35-15\right)+\left(36-16\right)+\left(37-17\right)=0\)
(-16)+24+16-34=24-34=-10
25+37-48-25-37=(25-25)+(37-37)-48=-48
2575+37-2576-29=8-1=7
34+35+36+37-14-15-16-17
=(34-14)+(35-15)+(36-16)+(37-17)
=20+20+20+20=20.4=80
/ (-37) +14+ 26 + 37
= (-37+37) + 14 + 26
= 0 + 14 + 26
= 40
2/ (-24) + 6 + 10+24
= (-24+24) + 6 +10
= 0 + 6 + 10
= 16
3/ 15+23+(-25) + (-23)
= (23-23) + 15 - 25
= 0 + 15 - 25
= -10
4/ 60+33+ (-50) +(-33)
= (33-33) + 60 -50
= 0 + 60 - 50
= 10
5/ (-16) + (-209) + (-14) + 209
= (-209+209) - 16 - 14
= 0 - 16 - 14
= -30
6/ (-12) + (-13) +36 + (-11)
= (-12-13-11) + 36
= -36 + 36
= 0
7/ -16+ 24 + 16-34
= (-16+16) + 24 - 34
= 0 + 24 - 34
= -10
8/ 25+37-48-25-37
= (37-37) + (25-25) - 48
= 0 + 0 - 48
= -48
9/2575+37-2576-29
= (2575-2576) + 37 - 29
= -1 + 37 - 29
= -1- 29 + 37
= -30 + 37
= 7
10/34 +35+36 +37-14-15- 16-17
= (34 - 14) + (35 - 15) + (36 - 16) + (37 - 17)
= 20 + 20 + 20 + 20
= 20 . 4
= 80
-28 . 25 + 75 . ( -25 )
= -700 + ( - 1875 )
= -2575
37 . (27 + 25) - 27. (37 + 35)
= 999 + 925 . 999 - 945
= 925 + ( -945 )
= -20
Có cách nhanh hơn
-28x25+72x(-25)=(-28)x25+(-72)x25
=25x[(-28)+(-72)]=25x(-100) =(-2500)
37(27+25)-27(37+35)=0
k minh nha
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CÁC EM TỰ LÀ ĐI MẤY BÀI NÀY DỄ LĂM CHỊ HỌC LỚP 8 NÊN CHỊ BIẾT NHƯNG ĐỪNG BẢO CHỊ LÀ CHO HAY GỢI Ý CÁCH LÀM NHA.
a) \(-75+\left(-325\right)+\left|-45\right|-\left(-125\right)\)
\(=-75-325+45+125\)
\(=\left(45+125\right)-\left(75+325\right)\)
\(=170-400\)
\(=-230\)
b) \(62+\left|128\right|-\left|-155\right|-\left|70\right|\)
\(=62+128-155-70\)
\(\Leftrightarrow190-225\)
\(=-35\)
c) \(815+\left[95+\left(-815\right)+\left(-45\right)\right]\)
\(=815+95-815-45\)
\(=\left(815-815\right)+\left(95-45\right)\)
\(=0+50\)
\(=50\)
d) \(5+\left(-7\right)+9+\left(-11\right)+...+25+\left(-27\right)\)
\(=\left(5-7\right)+\left(9-11\right)+...+\left(25-27\right)\)
\(=-2-2-...-2\)
\(=-2.11\)
\(=-22\)
e) \(34+35+36+37-24-25-26-27\)
\(=\left(34-24\right)+\left(35-25\right)+\left(36-26\right)+\left(37-27\right)\)
\(=10+10+10+10\)
\(=40\)
\(\frac{7500-100}{600-35}=\frac{7400}{565}=\frac{1480}{113}\)
1) \(25+37-48-25-37=\left(25-25\right)+\left(37-37\right)-48=-48\)
2) \(37+35+36+37-14-15-16-17\)
\(=\left(37-17\right)+\left(35-15\right)+\left(36-16\right)+\left(37-14\right)\)
\(=20+20+20+23=83\)