简便运算3.6 2.4X0.8=
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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