计算下面各题,怎样简便就怎样计算 540+78+160 363-1...
计算下面各题,怎样简便就怎样计算540+78+160363-154-14641+125+59+7528×2592×17-92×7455-(155+230)32×16+14...
计算下面各题,怎样简便就怎样计算 540+78+160 363-154-146 41+125+59+75 28×25 92×17-92×7 455-(155+230) 32×16+14×32 690÷15÷2 64×99.
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①540+78+160
=78+(540+160)
=78+700
=778;
②363-154-146
=363-(154+146)
=363-300
=63;
③41+125+59+75
=(41+59)+(125+75)
=100+200
=300;
④28×25
=7×(4×25)
=7×100
=700;
⑤92×17-92×7
=92×(17-7)
=92×10
=920;
⑥455-(155+230)
=455-155-230
=300-230
=70;
⑦32×16+14×32
=32×(16+14)
=32×30
=960;
⑧690÷15÷2
=690÷(15×2)
=690÷30
=23;
⑨64×99
=64×100-61×1
=6400-64
=6336.
=78+(540+160)
=78+700
=778;
②363-154-146
=363-(154+146)
=363-300
=63;
③41+125+59+75
=(41+59)+(125+75)
=100+200
=300;
④28×25
=7×(4×25)
=7×100
=700;
⑤92×17-92×7
=92×(17-7)
=92×10
=920;
⑥455-(155+230)
=455-155-230
=300-230
=70;
⑦32×16+14×32
=32×(16+14)
=32×30
=960;
⑧690÷15÷2
=690÷(15×2)
=690÷30
=23;
⑨64×99
=64×100-61×1
=6400-64
=6336.
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