计算下面各题,怎样简便就怎样算. (1)58×72+28×58 (2)3000÷125÷8 (3)486-137-63
计算下面各题,怎样简便就怎样算.(1)58×72+28×58(2)3000÷125÷8(3)486-137-63(4)540÷54+10×54(5)99×78+78(6)...
计算下面各题,怎样简便就怎样算. (1)58×72+28×58 (2)3000÷125÷8 (3)486-137-63 (4)540÷54+10×54 (5)99×78+78 (6)125×24 (7)37+125+63+175.
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(1)58×72+28×58
=58×(72+28)
=58×100
=5800
(2)3000÷125÷8
=3000÷(125×8)
=3000÷1000
=3
(3)486-137-63
=486-(137+63)
=486-200
=286
(4)540÷54+10×54
=10+540
=550
(5)99×78+78
=78×(99+1)
=78×100
=7800
(6)125×24
=125×8×3
=1000×3
=3000
(7)37+125+63+175
=(37+63)+(125+175)
=100+300
=400
=58×(72+28)
=58×100
=5800
(2)3000÷125÷8
=3000÷(125×8)
=3000÷1000
=3
(3)486-137-63
=486-(137+63)
=486-200
=286
(4)540÷54+10×54
=10+540
=550
(5)99×78+78
=78×(99+1)
=78×100
=7800
(6)125×24
=125×8×3
=1000×3
=3000
(7)37+125+63+175
=(37+63)+(125+175)
=100+300
=400
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