用简便方法计算下面各题312×4+188×4
用简便方法计算下面各题.312×4+188×4101×8725×33×44200÷24273-66-3498+365+2025×99+53200÷25÷41236+999...
用简便方法计算下面各题. 312×4+188×4 101×87 25×33×4 4200÷24 273-66-34 98+365+202 5×99+5 3200÷25÷4 1236+999.
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(1)312×4+188×4
=(312+188)×4
=500×4
=2000;
(2)101×87
=(100+1)×87
=100×87+1×87
=8700+87
=8787;
(3)25×33×4
=25×4×33
=100×33
=3300;
(4)4200÷24
=4200÷6÷4
=700÷4
=175;
(5)273-66-34
=273-(66+34)
=273-100
=173;
(6)98+365+202
=98+202+365
=300+365
=665;
(7)5×99+5
=5×(99+1)
=5×100
=500;
(8)3200÷25÷4
=3200÷(25×4)
=3200÷100
=32;
(9)1236+999
=1236+1000-1
=2236-1
=2235.
=(312+188)×4
=500×4
=2000;
(2)101×87
=(100+1)×87
=100×87+1×87
=8700+87
=8787;
(3)25×33×4
=25×4×33
=100×33
=3300;
(4)4200÷24
=4200÷6÷4
=700÷4
=175;
(5)273-66-34
=273-(66+34)
=273-100
=173;
(6)98+365+202
=98+202+365
=300+365
=665;
(7)5×99+5
=5×(99+1)
=5×100
=500;
(8)3200÷25÷4
=3200÷(25×4)
=3200÷100
=32;
(9)1236+999
=1236+1000-1
=2236-1
=2235.
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