作业帮简便运算3.6 2.4X0.8=
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/12 02:04:27
7.5=2.5×322.5=2.5×9所以就变成2.5×(3×2.3+1.9+9×0.4)=2.5×(6.9+1.9+3.6)=25×12.4=31
我算题再答：不骗你再答： 再问：太复杂了，我想到了一个简便的。谢谢！再问：等于1
7.56+0.12x0.9+0.44=(7.56++0.44)+0.12x(1-0.1)=8+0.12-0.012=8.12-0.012=8.108
3.52×0.79-0.173×7.9+1.79×0.21=3.52×0.79-1.73×0.79+1.79×0.21=(3.52-1.73)×0.79+1.79×0.21=1.79×0.79+1.7
2.8×0.5+1.58=1.4+1.58=1.4+1.6-0.02=3-0.02=2.98
（5.4+6.6-1）✘2.08=20.8
1.25x0.7x0.8=（1.25×0.8）×0.7=1×0.7=0.7再问：那9.8x25呢
=2.6*1+0.264-0.26=2.6-0.04=2.56
(-3.85)x(-13)+(-13)x(-6.15)+0.79x7/15+8/15x0.79=(-13)(-3.85-6.15)+0.79x(7/15+8/15)=130+0.79=130.7999
依然范特西摩羯,2.4×0.19＋0.24×8.1＝0.24×1.9＋0.24×8.1＝0.24×（1.9＋8.1）＝0.24×10＝2.4
7.2x4.6+46x0.28=7.2x4.6+4.6x10x0.28=7.2x4.6+4.6x2.8=4.6x(7.2+2.8)=4.6x10=469.8x3.6+7.2x0.1=9.8x3.6+3
原式=7.5*（1.9+0.4）+1.9*2.5+22.5*0.4=7.5*1.9+7.5*0.4+1.9*2.5+22.5*0.4=1.9*（7.5+2.5）+0.4*（7.5+22.5）=1.9*
9.5（100x0,98+2）=9.5x100=950
12.5x0.25x3.2=（12.5×0.8）x（0.25x4）=10×1=10
=7/8×+3/8+3/8×9/8=（7/8+9/8）×3/8=2×3/8=3/4