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\(75.17-17.25+5^2\)
\(=75.17-17.25+25\)
\(=17.\left(75-25+25\right)\)
\(=17.\left(50+25\right)\)
\(=17.75\)
\(=1275\)
1) \(100-\left(3.5^2-2.3^2\right)\)
\(=100-\left(3.25-2.9\right)\)
\(=100-\left(75-18\right)\)
\(=100-57\)
\(=43\)
2) \(2665:\left[213-\left(17-3^2\right)\right]+347.5^2\)
\(=2665:\left[213-\left(17-9\right)\right]+347.25\)
\(=2665:\left[213-8\right]+8675\)
\(=2665:205+8675\)
\(=13+8675\)
\(=8688\)
a, 100 - ( 3. 52 - 2 . 32 )
= 100 - 3.( 52 - 6 )
= 100 - 3 .19
= 100 - 57
=43
b, 2665: [ 213 - ( 17 - 32 ) ] + 347 . 52
= 2665 : [213 - 8 ] + 8675
= 13 + 8675
=8688
1,100-(3.5\(^2\)-2.3\(^2\))
=100-(3.25-2.9)
=100-(75-18)
=100-57
=43
2,2665:\([\)213-(17-3\(^2\))\(]\)+347.5\(^2\)
=2665:\([\)213-8\(]\)+8675
=2665:205+8675
=13+8675
=8688
a)=-7/21+8/24
=-1/3+1/3
=0
b)=-3/5.(2/7+5/7)+23/5
=-3/5.7/7+23/5
=-3/5.1+23/5
=-3/5+23/5
=20/5=4
c)=75/100-11/2+5/10:5/12+1/4
=3/4-11/2+1/2:5/12+1/4
=3/4+-11/2+1/2.12/5+1/4
=3/4+-22/4+6/5+1/4
=-19/4+6/5+1/4
=(-19/4+1/4)+6/5
=-18/4+6/5
=-9/2+6/5
=-45/10+12/10
=-23/10
119+(-213)+212+(-118)+2012=(-94)+212+(-118)+2012=118+(-118)+2012=0+2012=2012
Bài 1 a, \(17.25\)
\(=\left(1+16\right).25\)
\(=1.25+16.25\)
\(=25+4.4.25\)
\(=25+4.100\)
\(=25+400\)
\(=425\)
b, Bạn kia làm rồi nhé!
c, \(29.31+66.69+31.37\)
\(=31.\left(29+37\right)+66.99\)
\(=31.66+66.69\)
\(=66\left(31+69\right)\)
\(=66.100\)
\(6600\)
a: \(F=91\cdot100=9100\)