怎样简便怎样算. 55×25+25×45 77×13-13×27  ...
怎样简便怎样算.55×25+25×4577×13-13×27142+586+358+11444×25104×3255-36÷3+15400÷〔300-(260-160)〕...
怎样简便怎样算. 55×25+25×45 77×13-13×27 142+586+358+114 44×25 104×32 55-36÷3+15 400÷〔300-(260-160)〕 540÷(30×15÷15)
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(1)55×25+25×45,
=(55+45)×25,
=100×25,
=2500;
(2)77×13-13×27,
=(77-27)×13,
=50×13,
=650;
(3)142+586+358+114,
=(142+358)+(586+114),
=500+700,
=1200;
(4)44×25,
=11×4×25,
=11×(4×25),
=11×100,
=1100;
(5)104×32,
=(100+4)×32,
=100×32+4×32,
=3200+128,
=3328;
(6)55-36÷3+15,
=55-12+15,
=43+15,
=58;
(7)400÷〔300-(260-160)〕,
=400÷〔300-100〕,
=400÷200,
=2;
(8)540÷(30×15÷15),
=540÷30,
=18.
=(55+45)×25,
=100×25,
=2500;
(2)77×13-13×27,
=(77-27)×13,
=50×13,
=650;
(3)142+586+358+114,
=(142+358)+(586+114),
=500+700,
=1200;
(4)44×25,
=11×4×25,
=11×(4×25),
=11×100,
=1100;
(5)104×32,
=(100+4)×32,
=100×32+4×32,
=3200+128,
=3328;
(6)55-36÷3+15,
=55-12+15,
=43+15,
=58;
(7)400÷〔300-(260-160)〕,
=400÷〔300-100〕,
=400÷200,
=2;
(8)540÷(30×15÷15),
=540÷30,
=18.
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