用简便方法计算 (1)724+435+565+1076 (2)435-(135+189)(3)45×102 (4)75×199+75(5)900-405
用简便方法计算(1)724+435+565+1076(2)435-(135+189)(3)45×102(4)75×199+75(5)900-405(6)125×32(7)...
用简便方法计算 (1)724+435+565+1076 (2)435-(135+189)(3)45×102 (4)75×199+75(5)900-405 (6)125×32 (7)420÷35(8)(125-30)×8.
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(1)724+435+565+1076
=(724+1076)+(435+565)
=1800+1000
=2800
(2)435-(135+189)
=435-135-189
=300-189
=111
(3)45×102
=45×(100+2)
=45×100+45×2
=4500+90
=4590
(4)75×199+75
=75×(199+1)
=75×200
=15000
(5)900-405
=900-(400+5)
=900-400-5
=500-5
=495
(6)125×32
=125×8×4
=1000×4
=4000
(7)420÷35
=420÷7÷5
=60÷5
=12
(8)(125-30)×8
=125×8-30×8
=1000-240
=760
=(724+1076)+(435+565)
=1800+1000
=2800
(2)435-(135+189)
=435-135-189
=300-189
=111
(3)45×102
=45×(100+2)
=45×100+45×2
=4500+90
=4590
(4)75×199+75
=75×(199+1)
=75×200
=15000
(5)900-405
=900-(400+5)
=900-400-5
=500-5
=495
(6)125×32
=125×8×4
=1000×4
=4000
(7)420÷35
=420÷7÷5
=60÷5
=12
(8)(125-30)×8
=125×8-30×8
=1000-240
=760
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