下面各题,怎样简便就怎样算.6.45-3.62+5.62 16.78-2.54+3.22-1...
下面各题,怎样简便就怎样算.6.45-3.62+5.6216.78-2.54+3.22-1.4632×254200÷(50×7)58×23+23×42101×53-53...
下面各题,怎样简便就怎样算.6.45-3.62+5.62 16.78-2.54+3.22-1.46 32×25 4200÷(50×7) 58×23+23×42 101×53-53
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(1)6.45-3.62+5.62
=6.45+(5.62-3.62)
=6.45+2
=8.45
(2)16.78-2.54+3.22-1.46
=(16.78+3.22)-(2.54+1.46)
=20-4
=16
(3)32×25
=8×(4×25)
=8×100
=800
(4)4200÷(50×7)
=4200÷7÷50
=600÷50
=12
(5)58×23+23×42
=(58+42)×23
=100×23
=2300
(6)101×53-53
=(101-1)×53
=100×53
=5300
=6.45+(5.62-3.62)
=6.45+2
=8.45
(2)16.78-2.54+3.22-1.46
=(16.78+3.22)-(2.54+1.46)
=20-4
=16
(3)32×25
=8×(4×25)
=8×100
=800
(4)4200÷(50×7)
=4200÷7÷50
=600÷50
=12
(5)58×23+23×42
=(58+42)×23
=100×23
=2300
(6)101×53-53
=(101-1)×53
=100×53
=5300
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