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1.5x 6.5 3.5x 10

简便计算 3.5x1.5+6.5÷2.5 3.5x1.5+6.5÷2.5 =5.25+2.6 =7.85 直接计算

(1)2.7×2-1.5x=0 5.4-1.5x=0 5.4-1.5x+1.5x=0+1.5x 1.5x=5.4 1.5x÷1.5=5.4÷1.5 x=3.6;(2)13x-6.8x+x=46.8 7.2x=46.8 7.2x÷7.2=46.8÷7.2 x=6.5;(3)2.6x-6.5+3.5=10 2.6x-3=10 2.6x-3+3=10+3 2.6x=13 2.6x÷2.6=13÷2.6 x=5;(4)2×(x-0.7...

x=[0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4]; y=[30 22.5 15 10.5 6.5 4.5 3 2.5 1.5];cftool打开拟合界面, 结果:Linear model Poly2: f(x) = p1*x^2 + p2*x + p3Coefficients (with 95% confidence bounds): p1 = 2.317 (1.841, 2.793) p2 = -16.04...

3.5x( 1.4 )十6.5x( 1.4 )=14 谢谢,请采纳

>> x=[1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 7 8 9 10 11]; >> y=[4 4.6 8 8.4 9.28 9.5 9.7 9.86 10 10.2 10.32 10.30 10.24 10.18 10.00 9.40]; >> pp=polyfit(x,y,4);%拟合为4次多项式 >> xx=1:0.1:11; >> yy=polyval(pp,xx); >> plot(xx,yy) %拟...

能用笔写吗,我帮你做

解:3.7x6.5+3.5 =3.7*(10-3.5)+3.5 =37-3.7*3.5+3.5 =37-2.7*3.5 =37-9.45 =27.55

10.5-2.5÷2.4x2.4-3.5=?用简便方法计算 10.5-2.5÷2.4x2.4-3.5 =10.5-2.5-3.5 =10.5-(2.5+3.5) =10.5-6 =4.5

3.5x+6.5x=27.5 10x=27.5 x=2.75 x的值是2.75

用简便计算3.5十6.5x1.2 3.5十6.5x1.2 =3.5+7.8 =11.3 直接计算

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