计算:能简算要简算.(1)5.65×35%﹢7.48×720-3.13×0.35;(2)(45+14)÷73+710;(3)83×57+2÷75-57;(4)72×(1112+718+524)
计算:能简算要简算.
(1)5.65×35%﹢7.48×-3.13×0.35;
(2)(+)÷+;
(3)83×+2÷-;
(4)72×(++)
答案和解析
(1)5.65×35%﹢7.48×
-3.13×0.35
=5.65×0.35﹢7.48×0.35-3.13×0.35
=(5.65+7.48-3.13)×0.35
=10×0.35
=3.5;
(2)(+)÷+
=÷+
=+
=;
(3)83×+2÷-
=83×+2×-
=(83+2-1)×
=84×
=60;
(4)72×(++)
=72×+72×+72×
=66+28+15
=94+15
=109.
1.已知x^2-4x+1=0,则x^4+1/x^4=2.如果方程a/(x-2)+3=(1-x)/( 2020-06-25 …
4.2与1.2的差除它们的和,商是多少?正确的列式是[]A.(4.2-1.2)÷(4.2+1.2) 2020-06-27 …
大家帮我这些题对么计算(-1)^100×5+(-2)^4÷4=1×5+16÷4=5+4=97/6× 2020-07-13 …
1.0.3:12=2.0.25:4=3.2.8:0.7=4.2.1:1.2=5.0.1:0.8=6 2020-07-17 …
某同学在计算3(4+1)(4^2+1)时,把3写成(4-1)后,发现可以连续运用两数和乘以这两数差 2020-07-19 …
1计算.①.42*(-2/3)+(-3/4)除(-1/4)=2.-1^4-1/6*[2-(-3)] 2020-07-22 …
已知向量组α1,α2,α3,α4线性无关,则A.α1+2α2,α2+α3,2α3+α4,α4+α1 2020-07-26 …
(ps:a^2为a的平方,1/4就是四分之一)某同学在计算3(4+1)(4^2+1)时,把3写成4 2020-08-02 …
小明在计算3(4+1)(4∧2+1)时,把3写成4-1后,得3(4+1)(4^2+1)=(4-1)( 2020-11-07 …
某同学在计算3(4+1)(4^2+1)时,把3写成(4-1)后,得3(4+1)(4^2+1)=(4- 2020-11-07 …