能简便计算的尽量用简便方法计算37×49+37×51 &nb...
能简便计算的尽量用简便方法计算37×49+37×51102×4625×43×2×4700÷25165÷[3×(47-42)]105×34-34×5....
能简便计算的尽量用简便方法计算37×49+37×51 102×46 25×43×2×4 700÷25 165÷[3×(47-42)] 105×34-34×5.
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(1)37×49+37×51
=37×(49+51)
=37×100
=3700;
(2)102×46
=(100+2)×46
=100×46+2×46
=4600+92
=4692;
(3)25×43×2×4
=25×4×2×43
=100×2×43
=200×43
=8600;
(4)700÷25
=(700×4)÷(25×4)
=2800÷100
=28;
(5)165÷[3×(47-42)]
=165÷[3×5]
=165÷15
=11;
(6)105×34-34×5
=(105-5)×34
=100×34
=3400.
=37×(49+51)
=37×100
=3700;
(2)102×46
=(100+2)×46
=100×46+2×46
=4600+92
=4692;
(3)25×43×2×4
=25×4×2×43
=100×2×43
=200×43
=8600;
(4)700÷25
=(700×4)÷(25×4)
=2800÷100
=28;
(5)165÷[3×(47-42)]
=165÷[3×5]
=165÷15
=11;
(6)105×34-34×5
=(105-5)×34
=100×34
=3400.
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