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当前位置:首页 >> 2.5x1.7x4= 3.2x1.9+1.9x6.8= (8+0.8)x1.25 >>

2.5x1.7x4= 3.2x1.9+1.9x6.8= (8+0.8)x1.25

1.2x2.5+0.8x2.5 =(1.2+0.8)x2.5 =2x2.5 =5

2.5x4+2.5x0.8 =10+2.5x0.4x2 =10+1x2 =10+2 =12 1.5+8.5x6.8 =1.5+57.8 =59.3 0.88x1.25 =(0.8+0.08)x1.25 =0.8x1.25+0.08x1.25 =1+0.1 =1.1

(X+0.8)x8=48 x+0.8=48÷8 x+0.8=6 x=6-0.8 x=5.2

=0.8x1.13x1.25x4 =(0.8x1.25)x(1.13x4) =1x4.52 =4.52

第二题不全哇~ 检验的时候,将算出来的数,带入方程左边即可。 不懂请追问。

原式= (1/2)(2/3)(3/4)(4/5)(5/6)(6/7)(7/8)(8/9)/(0.1+0.9+0.2+0.8+0.3+0.7+0.4+0.6+0.5) 分子可以约分,约分后很简单,可得分子为1/9,分母组合后算出来是4.5,分子除以分母 原式=1/9/4.5=2/81

1.2x2.5+0.8x2.8 =3×0.4×2.5+(1—0.2)×2.8 =3+2.8—0.2×2.8 =5.8—0.56 =5.24

=6.8x(0.1+5+4.9) =6.8x10=68

接下

2(x+x+0.8)÷3=1.2解方程 解:2x+0.8=1.2x3➗2 2x=1.8-0.8 x=0.5

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