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(3.75%3.75x0.4)1.3+0.2简便计算

(1)62.8×19-8×6245-6245,=62.8×(19-8-1),=62.8×10,=628;(2)9511-(3.75+4511),=9511-3.75-4511,=9511-4511-3.75,=5-3.75,=1.25;(3)10.04-[1-(1-0.5×13)],=10.04-[1-(1-16)],=10.04-[1-56],=10.04-16,=25-16,=2456;...

三又四分之十五乘一点二五加37.5乘0.975,减375% =3+3.75x1.25+37.5x0.975-3.75 =3+3.75x(1.25+9.75-1) =3+3.75x10 =3+37.5 =40.5 请采纳正确答案,你们只提问,不采纳正确答案,回答都没有劲!谢谢管理员推荐采纳!! 朋友,请【采纳答案】,...

解:①设g(x0,y0)=0,即(x/3,y/2)=(x0,y0) 故x=3x0,y=2y0 ∴2y0=lg(3x0+1) 即g(x)=lg√(3x+1) ②h(x)=lg[√(3x+1)/(x+1)] 易知此函数定义域为x>-1/3 设F(x)=√(3x+1)/(x+1) 令F'(x)≥0得x≤1/3 ∴F(x)的最大值为F(1/3)=3√2/4 即h(x)的最大值为lg(3√2/4) 1...

(1)3-19×112+56,=3-19×32+56,=3-16+56,=3+(56-16),=3+23,=323;(2)0.9-(0.15+0.35÷57),=0.9-(0.15+0.35×75),=0.9-(0.15+0.49),=0.9-0.64,=0.26;(3)7.25-337+3.75-647,=7.25+3.75-(337+647),=11-10,=1;(4)(2-34...

9.875-(3又8分之7-75%)+3又4分之1 =9.875-3又8分之7+75%+3又4分之1 =6+4 =10

(1)4.35+8.6+153.65+1.4=(4.35+153.65)+(8.6+1.4)=158+10=168;(2)19.32-5.56-3.44=19.32-(5.56+3.44)=19.32-9=10.32;(3)6.25-4.8+3.75-1.2=(6.25+3.75)-(4.8+1.2)=10-6=4;(4)29.44-(9.44+0.823)=29.44-9.44-0.823=20-0.8...

(1)4×3.75+0.25=4×4=16=0(×)改正:4×3.75+0.25=15+0.25,=15.25;(2)6.4+3.6×5.3=10×5.3=53(×)改正:6.4+3.6×5.3=6.4+19.08=25.48;(3)15.8-0.8×2=15×2=30(×)改正:15.8-0.8×2=15.8-1.6,=14.2;(4)4.5×0.9+6.8=4.05+6.8=4.73.(...

0.6-1/4-(-3.75)+2/5 =0.6+0.4+(3.75-0.25) =1+3.5 =4.5 (-2/5)+(-3又4/7)-1.6-(-11/7) =-(0.4+1.6)-(3又4/7-1又4/7) =-2-2 = -4

(1)12.53-1.35×2-9.3 =12.53-2.7-9.3 =12.53-(2.7+9.3) =12.53-12 =0.53 (2)0.8×(4-3.75)÷0.1 =0.8×0.25÷0.1 =0.2÷0.1 =2 (3)13.5×0.68÷8.5 =13.5÷5×(0.68÷1.7) =2.7×0.4 =1.08 (4)20-【7.8+(6.2+1.29)】 =20-【7.8+6.2+1.29】 =20-【14+1...

1、4-3.5-[(-2.5-1.2+4)-6.9]=4-4-3.5+2.5+1.2+6.9=7.1 2、3.75-[(-8分之3)+(-2分之1)-(-6分之5)+4又3分之2]-0.125 =3+3/4+3/8+1/2-5/6-4-2/3-1/8 =(3-4)+[3/4+(3/8-1/8)]+(1/2-5/6-2/3) =-1+1+3/6-5/6-4/6 =-6/6 =-1

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