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4(x一0.8)=9.8

4(x-0.8)=9 x-0.8=9 ÷ 4 x-0.8=2.25 x=2.25+0.8 x=3.05

(1)0.8x+0.4x=1.2, 1.2x=1.2, 1.2x÷1.2=1.2÷1.2, x=1;(2)32x-9x-13x=60, 10x=60, 10x÷10=60÷10, x=6;(3)0.7x+4=1027, 0.7x+4-4=1027-4, 0.7x=1023. 0.7x÷0.7=1023÷0.7, x=146137;(4)x-3×9=8, x-27=8, z-27+27=8+27, x=3...

0.4(x+9)=0.5(10.8一X) 0.4x+3.6=5.4-0.5x 0.9x=1.8 x=2

解由8分之9:0.8X等于3分之4 得0.8x=9/8÷(4/3)=27/32 即4x/5=27/32 即x=135/128

解:因为X~N(3, 4),则(X-3)/2 ~ N(0, 1)(标准正态分布), P(5

9.8x-56=0 9.8x=56 x=56÷9.8=40/7

就是求H(jw)是吧

16.4÷0.8*1.9 =1.9*20.5 =1.9*(20+0.5) =1.9*20+1.9*0.5 =38+0.95 =38.95

10-9.8+9.6-9.4+9.2-9+...+0.8-0.6+0.4-0.2 =0.2×(50-49+48-47+…+4-3+2-1) =0.2×1×50/2 =0.2×25 =5

8×9×1.25 =8×1.25×9 =10×9 =90 9.8×0.34+0.66×9.8 =9.8×(0.34+0.66) =9.8×1 =9.8

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