240[(68-53)Ⅹ2]简便计算
计算437÷23×(6+15)12×[(120-45)÷15]82-80×15÷20 &...
计算 437÷23×(6+15) 12×[(120-45)÷15] 82-80×15÷20 700-988÷19×12 240÷[(68-53)×2] 560÷[(12+8)×4]
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(1)437÷23×(6+15)
=19×21
=399;
(2)12×[(120-45)÷15]
=12×[75÷15]
=12×5
=60;
(3)82-80×15÷20
=82-1200÷20
=82-60
=22;
(4)700-988÷19×12
=700-52×12
=700-624
=76;
(5)240÷[(68-53)×2]
=240÷[15×2]
=240÷30
=8;
(6)560÷[(12+8)×4]
=560÷[20×4]
=560÷80
=7.
=19×21
=399;
(2)12×[(120-45)÷15]
=12×[75÷15]
=12×5
=60;
(3)82-80×15÷20
=82-1200÷20
=82-60
=22;
(4)700-988÷19×12
=700-52×12
=700-624
=76;
(5)240÷[(68-53)×2]
=240÷[15×2]
=240÷30
=8;
(6)560÷[(12+8)×4]
=560÷[20×4]
=560÷80
=7.
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