180道,发来者,加200分格式为1+2+3=3+3=6
3个回答
1、 9 × 3/10 + 3/10
=(9+1)*3/10
=10*3/10
=3
2、480+325+75
=480+(325+75)
=480+400
=880
3、295-128-72
=295+（128+72）
=295+200
=495
4、43×25×4
=43×（25×4）
=43×100
=4300
5、102×43
=（100+2）×43
=100×43+2×43
=4300+86
=4386
6、9×37+9×63
=9×（63+37）
=9×100
=900
7.66×38-987÷21
=2508-987÷21
=2508-47
=2461
8.1.25*17.6+36.1/0.8+2.36*12.5
1.25*17.6+36.1/0.8+2.36*12.5
=(5/4)*17.6+36.1*(5/4)+23.6*(50/4)
=176/8+361/8+236/8
=773/8=96.625
9.7.5*2.3+1.9*2.5
7.5*2.3+1.9*2.5
=7.5*(1.9+0.4)+1.9*2.5
=(7.5+2.5)*1.9+7.5*0.4
=19+3 =22
我就写这些了,是关于简便的算法的,更多的可以去百度文库搜索一下吧
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