Question

数学递等式计算（怎么简便怎么算）

①101×7.8 ②六分之五＋5.2＋六分之一＋5.2 ③1。9×32×125×0.25 ④8。6×三分之二＋8.6÷3 ⑤2.74÷十四分之五＋7.26×2.8

Answer 1

递等式计算怎么算！

Answer 2

①101×7.8
=(100+1)×7.8
=100×7.8+1×7.8
=780+7.8
=787.8

②六分之五＋5.2＋六分之一＋5.2
=六分之五＋六分之一＋5.2＋5.2
=1+10.4
=11.4

③1.9×32×125×0.25
=1.9×8×125×4×0.25
=1.9×1000×1
=1900

④8.6×三分之二＋8.6÷3
=8.6×三分之二＋8.6× 3分之1
=8.6×(3分之2+ 3分之1）
=8.6

⑤2.74÷十四分之五＋7.26×2.8
=2.74× 5分之14 +7.26× 5分之14
=（2.74 +7.26）× 5分之14
=10× 5分之14
=28

Answer 3

①101×7.8=（100+1）×7.8=780+7.8=787.8
②5/6＋5.2＋1/6＋5.2 =(5/6+1/6)+5.2×2=11.4
③1.9×32×125×0.25 =1.9 ×125×(32×0.25)=1.9×(125×8)=1.9×1000=1900
④8.6×2/3＋8.6÷3=8.6×2/3＋8.6×1/3=8.6×(2/3+1/3)=8.6
⑤2.74÷5/14＋7.26×2.8=2.74×2.8＋7.26×2.8=(2.74+7.26)×2.8=28

希望楼主采纳·~~~

Answer 4

101×7.8
=(100+1)×7.8
=100×7.8+1×7.8
=780+7.8
=787.8
六分之五＋5.2＋六分之一＋5.2
=六分之五＋六分之一＋5.2＋5.2
=1+10.4
=11.4
1.9×32×125×0.25
=1.9×8×125×4×0.25
=1.9×1000×1
=1900
8.6×三分之二＋8.6÷3
=8.6×三分之二＋8.6× 3分之1
=8.6×(3分之2+ 3分之1）

Answer 5

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