用递等式计算(1)1379+450÷18×40(2)(3.2...4
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发布时间:2024-02-26 07:08
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时间:2024-08-06 18:47
(1)1379+450÷18×40,
=1379+25×40,
=1379+1000,
=2379;
(2)(3.2÷16+10.8)÷22,
=(0.2+10.8)÷22,
=11÷22,
=0.5;
(3) 5 11 × 7 25 + 7 25 × 6 11 ,
=( 5 11 + 6 11 )× 7 25 ,
=1× 7 25 ,
= 7 25 ;
(4) 1 4 × 1 7 ÷( 5 6 - 3 4 ),
= 1 4 × 1 7 ÷ 1 12 ,
= 1 4 × 1 7 ×12,
= 1 4 ×12× 1 7 ,
=3× 1 7 ,
= 3 7 .