278+265=
怎样简便就怎样算265+278+72278×991800÷25÷465×65+65×35320×2578+78×49+50×78...
怎样简便就怎样算 265+278+722 78×99 1800÷25÷4 65×65+65×35 320×25 78+78×49+50×78
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(1)265+278+722
=265+(278+722)
=265+1000
=1265;
(2)78×99
=78×(100-1)
=78×100-78×1
=7800-78
=7722;
(3)1800÷25÷4
=1800÷(25×4)
=1800÷100
=18;
(4)65×65+65×35
=65×(65+35)
=65×100
=6500;
(5)320×25
=(80×4)×25
=80×(4×25)
=80×100
=8000;
(6)78+78×49+50×78
=78×(1+49+50)
=78×100
=7800.
=265+(278+722)
=265+1000
=1265;
(2)78×99
=78×(100-1)
=78×100-78×1
=7800-78
=7722;
(3)1800÷25÷4
=1800÷(25×4)
=1800÷100
=18;
(4)65×65+65×35
=65×(65+35)
=65×100
=6500;
(5)320×25
=(80×4)×25
=80×(4×25)
=80×100
=8000;
(6)78+78×49+50×78
=78×(1+49+50)
=78×100
=7800.
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