72×〔960÷(245-165)〕
计算下面各题,能简算的要简算.840÷28+70×1872÷[960÷(245-165)]8.29+3.7+0.71+6.39.34-1.43-4.57101×87270...
计算下面各题,能简算的要简算. 840÷28+70×18 72÷[960÷(245-165)] 8.29+3.7+0.71+6.3 9.34-1.43-4.57 101×87 2700÷25÷4.
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(1)840÷28+70×18
=30+1260
=1290
(2)72÷[960÷(245-165)]
=72÷[960÷80]
=72÷12
=6
(3)8.29+3.7+0.71+6.3
=(8.29+0.71)+(3.7+6.3)
=9+10
=19
(4)9.34-1.43-4.57
=9.34-(1.43+4.57)
=9.34-6
=3.34
(5)101×87
=(100+1)×87
=100×87+100×1
=8700+87
=8787
(6)2700÷25÷4
=2700÷(25×4)
=2700÷100
=27
=30+1260
=1290
(2)72÷[960÷(245-165)]
=72÷[960÷80]
=72÷12
=6
(3)8.29+3.7+0.71+6.3
=(8.29+0.71)+(3.7+6.3)
=9+10
=19
(4)9.34-1.43-4.57
=9.34-(1.43+4.57)
=9.34-6
=3.34
(5)101×87
=(100+1)×87
=100×87+100×1
=8700+87
=8787
(6)2700÷25÷4
=2700÷(25×4)
=2700÷100
=27
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