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Bổ sung bài : Tính nhanh
\(46.57-38.73+57.54-73.62\)
\(=\left(46.57+57.54\right)-\left(38.73+73.62\right)\)
\(=57\left(46+54\right)-73\left(38+62\right)\)
\(=57.100-73.100\)
\(=5700-7300=-1600\)
46 x 57 -38x73+57x54-73x62
=57x(46+54)-73x(38+62)
=57x100-73x100
=100(57-73)
=100x (-16)
=-1600
a) 67+135+33
= ( 67+33)+135
= 100 + 135
= 235
b) 146+121+54+379
= ( 146+54)+( 121+379)
= 200 + 500
= 700
c) 198+232-98-32
= ( 232-32)+(198-98)
= 200 + 100
= 300
d)1+2+3+4+.........+50
= ( 50+1) x 50:2 =1275
e)2+4+6+8+..........+100
= ( 100+2) x 50 : 2 =2550
f) 23 x 56 +56
= 1288 + 56
= 1344
g)32 x 19+32
= 608 + 32
= 640
\(a.67+135+33\)
\(=\left(67+33\right)+135\)
\(=100+135=235\)
\(b.141+121+54+379\)
\(=\left(146+54\right)+\left(121+379\right)\)
\(=200+500=700\)
\(c.198+232-98-32\)
\(=\left(232-32\right)+\left(198-98\right)\)
\(=200+100=300\)
\(f.23.56+56=1288+56=1344\)
\(g.32.19+32=608+32=640\)
a) 40 - x = 54
x = 40 - 54
x = -14
b) 36 - x = -11
x = 36 - (-11)
x = 47
c) 2.x - 3 = -14
2x = -14 + 3
2x = -11
x = -11/2
27 x 31 + 31 x 73
= 31 x ( 27 x 73 )
= 31 x 100
= 3100
16 x 98 + 16 x 2
= 16 x ( 98 + 2 )
= 16 x 100
= 1600
\(a,573+67-\left(573-23\right)\\ =573+67-573+23\\=\left(573-573\right)+\left(67+23\right)\\ =0+90\\ =90\\ b,\left(-73\right)-\left[2^3.5-6\right].2\\ =\left(-73\right)-\left[8.5-6\right].2\\ =\left(-73\right)-\left[40-6\right].2\\ =\left(-73\right)-34.2\\ =\left(-73\right)-68\\ =-141\)
32 . 41+ 46.73 + 32.59 +73.54
=32.(41+59)+73.(46+54)
=32.100+73.100
=100.(32+73)
=100.105 = 10500
32*41+46*73+32*59+73*54
=(32*(41+59))+(73*(54+46))
=(32*100)+(73*100)
=3200+7300
=11500 k cho minh nha thuuuuuuuuuuu
\(\Rightarrow98-x=73-54\\ \Rightarrow98-x=19\\ \Rightarrow x=98-19=79\)
\(54+\left(98-x\right)=73\\ \Rightarrow98-x=19\\ \Rightarrow x=79\)