
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÷〔30
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. |
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