Question

奥数题简便方法

用简便方法计算

Answer 1

2.解原式=67×1/4+75/2×1/4-9/2×1/4
=1/4×（67+75/2-9/2）
=1/4×100
=25
3.解：原式=7.6×3.6+0.36×50-36×0.26
=7.6×3.6+3.6×5+3.6×2.6
=3.6×（7.6+5-2.6）
=3.6×10
=36
4.解：原式=0.1111×8×0.6+0.1111×2×7.6
=0.1111×（4.8+15.2）
=0.1111×20
=2.222
5.解：原式=5.6×10.2-1.4×4×0.2
=5.6×（10.2-0.2）
=5.6×10
=56
7.解：原式=465×8.2+465×29.6-（465-100）×37.8
=465×8.2+465×29.6-465×37.8+100×37.8
=465×（8.2+29.6-37.8）+100×37.8
=465×0+100×37.8
= 3780
8.解：原式=1/4×17×166-1/4×170×14.2+1/4×24×23
=1/4×（17×166-17×142+24×23）
=1/4×[17×(166-142)+24×23]
=1/4×[17×24+24×23]
=1/4×24×（17+23）
=1/4×24×40
=240

Answer 2

1.原式=9.875-3.875+0.75+3.25
=（9.875-3.875）+（0.75+3.25）
=6+4
=10
2.=67×0.25+2.5×3.75-4.5*0.25=67×0.25+0.25×37.5-4.5*0.25=（67+37.5-4.5）*0.25=25
3.=7.6*3.6+0.36*50-36*0.26.=7.6*3.6+3.6*5-3.6*2.6=（7.6+5-2.6）*3.6=36
4.

Answer 3

1、原式=9.875-3.875+3/4+3又1/4=6+（3/4+3又1/4）=6+4=10