Tính hợp lý
a.(286:11+7x2)x3-13
b.35x34+65x75+35x38+65x45
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35x34+35x34+65x75+65x45
= (35 x 34 + 35 x 34) + (65 x 75 + 65 x 45)
= 35 x 34 x 2 + 65 x (75 + 45)
= 2380 + 65 x 120
= 2380 + 7800
= 10180
35x34+35x34+65x75+65x45
= (35 x 34 + 35 x 34) + (65 x 75 + 65 x 45)
= 35 x 34 x 2 + 65 x (75 + 45)
= 2380 + 65 x 120
= 2380 + 7800
= 10180
35x34+35x38+65x45+65x27
=35x(34+38)+65x(45+27)
=35x72+65x72
=72x(35+65)
=72x100
=7200
35 x 34 + 35 x 38 + 65 x 45 + 65 x 27
= 35 x ( 34 + 38 ) + 65 x ( 45 + 27 )
= 35 x 72 + 65 x 72
= ( 35 + 65 ) x 72
= 100 x 72
= 7200
35 x 34 + 35 x 38 + 65 x 45 + 65 x 27
= 35 x (34 + 38) + 65 x ( 45 + 65)
= 35 x 72 + 65 x 110
= 2510 + 7150
= 9660
a, 35.(34+86) +65.(75+45)= 35. 120 +65.120= 120.(35+65)=120.100=12000
d) 35x34 +35x38 + 65x75 + 65x45
= 35 x ( 34 + 38 ) + 65 x ( 75 + 45 )
= 35 x 72 + 65 x 120
= 2520 + 7800
= 10 320
d) 35x34 +35x38 + 65x75 + 65x45
= 35 ( 34 + 38 ) + 65 ( 75 + 45)
= 35 * 72 + 65 * 120
= 2520 + 7800
= 10320
a,35x34+35x86+65x75+65x45
=35x(34+86)+65x(75+45)
=35x120+65x120
=120x(35+65)
=120x100
=12000
b,3x25x8+4x37x6+2x38x12
=(3x8)x25+(4x6)x37+(2x12)x38
=24x25+24x37+24x38
=24x(25+37+38)
=24x(62+38)
=24x100
=2400
c,12x53+53x172-53x84
=53x(12+172-84)
=53x(184-84)
=53x100
=5300
a.35x(34+86)+65x(75+45)=35x120+65x120=120x(35+65)=120x100=12000
b.3x25x8+4x37x6x2x38x12=24x25+24x37+24x38=24x(25+37+38)=24x100=2400
c.53x(12+172-84)=53x100=5300
1) a) \(35.34+35.58+65.75+65.45\)
\(=35\left(34+58\right)+65\left(75+45\right)\)
\(=35.92+65.120\)
\(=3220+7800=11020\)
b) \(39,8+60,2+21,8-100\)
\(=\left(39,8+60,2\right)-100+21,8\)
\(=100-100+21,8=0+21,8=21,8\)
c) \(36.28+64.49+36.82+41.64\)
\(=36\left(28+82\right)+64\left(49+41\right)\)
\(=36.110+64.90\)
\(=3960+5760\)\(=9720\)
a) 34 x 35 + 86 x 35 + 65 x 75 + 65 x 45
= ( 34 + 86 ) x 35 + 65 x ( 75 + 45 )
= 120 x 35 + 65 x 120
= 120 x ( 65 + 35 )
= 120 x 100
= 12000
b) ............
a. (286 : 11 +7 x 2) x 3 - 13
= (26 + 14) x 3 - 13
= 40 x 3 - 13
= 120 - 13
= 107
b. 35 x 34 + 65 x 75 + 35 x 38 + 65 x 45
= (35 x 34) + (65 x 75) + (35 x 38) + (65 x 45)
= 1190 + 4875 + 1330 + 2925
= (1190 + 1330) + (4875 + 2925)
= 2520 + 7800
= 10 320