1997+{145-(145-13)}
Thực hiện phép tính:
1997+[145-(145-13)]l-18l+2.(144:l-12l-2.l-3l)Ai làm nhanh, đúng mình tick cho !
1. 1997 + [145-(145-13)]
= 1997 + [145 - 132]
= 1997 + 13
= 2010
2. |-18|+2.(144:|-12|-2.|-3|)
= 18 + 2.(144: 12-2. 3)
= 18 + 2.(12 - 6)
= 18 + 2. 6
= 18 + 12
= 30
1/9.2/145-13/3.2/145+2/145
tính
\(\dfrac{1}{9}.\dfrac{2}{145}-\dfrac{13}{3}.\dfrac{2}{145}+\dfrac{2}{145}\)
\(=\dfrac{2}{145}.\left(\dfrac{1}{9}-\dfrac{13}{3}+1\right)\)
\(=\dfrac{2}{145}.\left(\dfrac{1}{9}-\dfrac{13}{3}+\dfrac{9}{9}\right)\)
\(=\dfrac{2}{145}.\left(-\dfrac{29}{9}\right)\)\(=-\dfrac{2}{45}\)
-145(13-57)+57(10-145)
a, 1/9 * 2/145-13/3 : 1/145 + 2/145.
Giups vs. Help me.^^
\(\frac{1}{9}.\frac{2}{145}-\frac{13}{3}:\frac{1}{145}+\frac{2}{145}=\frac{2}{145}\left(\frac{1}{9}+1\right)-\frac{13}{3}:\frac{1}{145}=\frac{2}{145}.\frac{10}{9}-\frac{1885}{3}=\frac{4}{216}-\frac{1885}{3}\)
\(=-\frac{33929}{54}\)
1,tính
23×(145-17)-145×(23-6)
145×(13-57)+57×(10-146)
- 145.(13-57)+57.(10-145)
.giúp mk tính từg bước vs ạk
C1: -145.(13-57)+57.(10-145)
=-145.(-44)+57.-135
=6380+(-7695)
=-1315
C2:SGK
-1315 tính trong ngoặc trước rồi nhân xong rồi công lại
1, Thuc hiện phép tính.
a, 1/9* 2.145-13/3 * 1/145+ 2/145
xin lỗi nha
\(=\frac{2}{145}\left(\frac{1}{9}+1\right)-\frac{13}{3}.\frac{1}{145}\)
\(=\frac{2}{145}.\frac{10}{9}-\frac{13}{3}.\frac{1}{145}\)
\(=\frac{1}{145}+\frac{1}{145}.\frac{10}{9}-\frac{13}{3}.\frac{1}{145}\)
\(=\frac{1}{145}\left(\frac{10}{9}-\frac{13}{3}+1\right)\)
\(=\frac{1}{145}.-\frac{20}{9}\)
\(=-\frac{4}{261}\)
Mk bị nhầm chỗ 2. 145 thành 2/145 nhé. thank kiuf.
\(\frac{1}{9}.\frac{2}{145}-\frac{13}{3}.\frac{2}{245}+\frac{2}{145}\)
\(=\frac{2}{145}\left(\frac{1}{9}-\frac{13}{3}+1\right)\)
\(=\frac{2}{145}.\left(-\frac{29}{9}\right)\)
\(=-\frac{2}{45}\)
1) -145.(13 - 57) + 57.(10 -145)
2) 17.(15 - 16) + 16.( 17- 20)
3) -38.(25 - 4) + 25.(-4 + 38 )
4) 23.(145 - 17) - 145.(23 - 6)
5) 24.(15 - 4) + 4.(24 - 15)
6) 199.(15 - 17) - 199.(-17 + 5)
7) -39.(5 - 99) + 99.(10 - 39)
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: \(=-39\cdot5+39\cdot99+99\cdot10-99\cdot39=795\)
1: =−145⋅13+145⋅57+57⋅10−57⋅145=−1315=−145⋅13+145⋅57+57⋅10−57⋅145=−1315
2: =17⋅15−17⋅16+16⋅17−16⋅20=255−320=−65=17⋅15−17⋅16+16⋅17−16⋅20=255−320=−65
3: =−38⋅25+38⋅4−25⋅4+25⋅38=13⋅4=52=−38⋅25+38⋅4−25⋅4+25⋅38=13⋅4=52
4: =23⋅145−23⋅17−145⋅23+145⋅6=479=23⋅145−23⋅17−145⋅23+145⋅6=479
5: =24⋅15−24⋅4+4⋅24−4⋅15=360−60=300=24⋅15−24⋅4+4⋅24−4⋅15=360−60=300
6: =199(15−17+17−5)=199⋅10=1990=199(15−17+17−5)=199⋅10=1990
7: =−39⋅5+39⋅99+99⋅10−99⋅39=795
tính nhanh
-145.(13-17)+57(10-145)
-39*(5-99)+99.(10-39)