用递等式计算,能简算的要简算.①16×(15+30÷3);②125×(40×8);③342-163-37+158;④54×101-54
用递等式计算,能简算的要简算.①16×(15+30÷3);②125×(40×8);③342-163-37+158;④54×101-54;⑤99×39;⑥[328-28×(...
用递等式计算,能简算的要简算.①16×(15+30÷3);②125×(40×8);③342-163-37+158;④54×101-54; ⑤99×39; ⑥[328-28×( 50÷5 )]×5.
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①16×(15+30÷3)
=16×(15+10)
=16×25
=400;
②125×(40×8)
=125×8×40
=1000×40
=40000;
③342-163-37+158
=342+158-(163+37)
=500-200
=300;
④54×101-54
=54×(101-1)
=54×100
=5400;
⑤99×39
=(100-1)×39
=100×39-1×39
=3900-39
=3861;
⑥[328-28×( 50÷5 )]×5
=[328-28×10]×5
=[328-280]×5
=48×5
=240.
=16×(15+10)
=16×25
=400;
②125×(40×8)
=125×8×40
=1000×40
=40000;
③342-163-37+158
=342+158-(163+37)
=500-200
=300;
④54×101-54
=54×(101-1)
=54×100
=5400;
⑤99×39
=(100-1)×39
=100×39-1×39
=3900-39
=3861;
⑥[328-28×( 50÷5 )]×5
=[328-28×10]×5
=[328-280]×5
=48×5
=240.
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①16×(15+30÷3)
=16×(15+10)
=16×25
=400;
②125×(40×8)
=125×8×40
=1000×40
=40000;
③342-163-37+158
=342+158-(163+37)
=500-200
=300;
④54×101-54
=54×(101-1)
=54×100
=5400;
⑤99×39
=(100-1)×39
=100×39-1×39
=3900-39
=3861;
⑥[328-28×( 50÷5 )]×5
=[328-28×10]×5
=[328-280]×5
=48×5
=240.
=16×(15+10)
=16×25
=400;
②125×(40×8)
=125×8×40
=1000×40
=40000;
③342-163-37+158
=342+158-(163+37)
=500-200
=300;
④54×101-54
=54×(101-1)
=54×100
=5400;
⑤99×39
=(100-1)×39
=100×39-1×39
=3900-39
=3861;
⑥[328-28×( 50÷5 )]×5
=[328-28×10]×5
=[328-280]×5
=48×5
=240.
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