用递等式计算.(能简便的就用简便方法计算)(1)684+37+316+63(2)147×56+147×45-147(3)25×125×
用递等式计算.(能简便的就用简便方法计算)(1)684+37+316+63(2)147×56+147×45-147(3)25×125×24×16(4)81+791×9(5...
用递等式计算.(能简便的就用简便方法计算)(1)684+37+316+63(2)147×56+147×45-147(3)25×125×24×16(4)81+791×9(5)(62×125+125×26)÷22(6)125×[920÷(750-727)].
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(1)684+37+316+63
=684+316+(37+63)
=1000+100
=1100;
(2)147×56+147×45-147
=147×(56+45-1)
=147×100
=14700;
(3)25×125×24×16
=25×16×(125×24)
=400×3000
=1200000;
(4)81+791×9
=9×9+791×9
=(9+791)×9
=800×9
=7200;
(5)(62×125+125×26)÷22
=(62+26)×125÷22
=88×125÷22
=88÷22×125
=4×125
=500;
(6)125×[920÷(750-727)]
=125×[920÷23]
=125×40
=5000.
=684+316+(37+63)
=1000+100
=1100;
(2)147×56+147×45-147
=147×(56+45-1)
=147×100
=14700;
(3)25×125×24×16
=25×16×(125×24)
=400×3000
=1200000;
(4)81+791×9
=9×9+791×9
=(9+791)×9
=800×9
=7200;
(5)(62×125+125×26)÷22
=(62+26)×125÷22
=88×125÷22
=88÷22×125
=4×125
=500;
(6)125×[920÷(750-727)]
=125×[920÷23]
=125×40
=5000.
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