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(9.5%1.2x4)x0.6简算

你在算算 是210个6

①1/5(x-8)+1/4x+x-1/7=6-23-x/5 解:28﹙x-8﹚+35x+20﹙x-1﹚=840-28﹙23-x﹚ 28x-224+35x+20x-20=840-644+28x 55x=440 ∴x=8 ②3(0.7x+0.1)+2(0.25x-0.2)=5.1 2.1x+0.3+0.5x-0.4=5.1 2.6x=5.2 ∴x=2 ③(1.2+x)/0.4-(0.5x+1)/。

3.6x5.7+3.67 =20.52+3.67 =24.19 2.57x99+2.57 =2.57x(99+1) =2.57x100 =257 5.3-0.6x0.24 =5.3-0.144 =5.156 3.9x4.5+4.5x6.1 =(3.9+6.1)x4.5 =10x4.5 =45 1.25x27x0.8 =1.25x0.8x27 =1x27 =27 2.5x(40+4+0.4) =2.5x4x11.1 =10x11.1 =111

见附图

第一个大

1/(1×2×3×4)+1/(2×3×4×5)+1/(3×4×5×6)+...+1/(7×8×9×10) =(1/3)×[1/(1×2×3)-1/(2×3×4)]+(1/3)×[1/(2×3×4)-1/(3×4×5)]+(1/3)×[1/(3×4×5)-1/(4×5×6)]+...+(1/3)×[1/(7×8×9)-1/(8×9×10)] =(1/3)×[1/(1×2×3)-1/(2×3×4)+1/(2×3×4)-1/(3×4×5)...

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