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`35 xx 34 + 35 xx 66 + 100 xx 7`
`= 35 xx ( 34+66) + 100 xx 7`
`= 35 xx 100 + 100 xx 7`
`= 3500 + 700`
`= 4200`
`35xx34+35xx66+100xx7`
`=35xx(34+66)+100xx7`
`=35xx100+100xx7`
`=100xx(35+7)`
`=100xx42`
`=4200`
\(\frac{7}{8}+0,5+\frac{3}{4}+0,125-\frac{75}{100}\)
\(=\frac{7}{8}+\frac{1}{2}+\frac{3}{4}+\frac{1}{8}-\frac{3}{4}\)
\(\left(\frac{7}{8}+\frac{1}{8}\right)+\left(\frac{3}{4}-\frac{3}{4}\right)+\frac{1}{2}\)
\(\frac{8}{8}+0+\frac{1}{2}\)
\(1+0+\frac{1}{2}\)
\(1+\frac{1}{2}\)
\(\frac{2}{2}+\frac{1}{2}\)
\(=\frac{3}{2}\)
100 : 0,25 + 50 : 0,25 + 120 *8 * 0,125
= 100 * 4 + 50 * 4 + 120 * 8 * 0,125
= 400 + 200 + 120 * 1
= 400 + 200 + 120
= 720
100:0,25+50:0,25+120x8x0,125
=100x4+50x4+120x8x8
=400+200+120x64
=600+768
=8286
(45+75)*66+(75+45)*34
=(45+75)*(66+34)
=120*100
=12000
11+22+33+44+55+66+77+88+99:11
=11+22+33+44+55+66+77+88+9
=(11+9)+(22+88)+(33+77)+(44+66)+55
=20+110*3+55
=20+330+55
=405
Ta có :
a, (45 + 75) x 66 + (75 + 45) x 34
= (45 + 75) x (66 + 34)
= 120 x 100
= 12000
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99 : 11
= 33 + 77 + 121 + 165 + 9
= 405
`13,5 : 0,5 + 13,5 : 100 + 13,5 : 0,125`
`=13,5xx2+13,5xx0,01+13,5xx8`
`=13,5xx(2+0,01+8)`
`=13,5xx10,01`
`=135,135`
13,5:0,5+13,5:100+13,5:0,12513,5:0,5+13,5:100+13,5:0,125
=13,5×2+13,5×0,01+13,5×8=13,5×2+13,5×0,01+13,5×8
=13,5×(2+0,01+8)=13,5×(2+0,01+8)
=13,5×10,01=13,5×10,01
=135,135
4,5 : 0,5 + 25 : 0,25 + 100 : 0,125
= 4,5 * 2 + 25 * 4 + 100 * 8
= 9 + 100 + 800
=809
12,5 x 4 + 0,125 x 8 - 10 x 0,1
= 0,125 x 400 + 0,125 x 8 - 0,125 x 80 x 0,1
= 0,125 x 400 + 0,125 x 8 - 0,125 x 8
= 0,125 x (400 + 8 - 8)
= 0,125 x 400
= 50
\(\dfrac{7}{8}+66\%+\dfrac{34}{100}+0,125\)
\(=0,875+0,66+0,34+0,125\)
\(=\left(0,875+0,125\right)+\left(0,66+0,34\right)\)
\(=1+1\)
\(=2\)
Tính nhanh: 7/8 + 66%+34/100 + 0,125