大师作文网(1+0.25+0.39)X(0.25+0.39+0.87)-(1+0.25+0.39+0.87)X(0.25+0.39
来源：学生作业帮 编辑：大师作文网作业帮 分类：数学作业 时间：2024/11/16 22:07:49
(1+0.25+0.39)X(0.25+0.39+0.87)-(1+0.25+0.39+0.87)X(0.25+0.39)怎么计算?要用简便方法,包括结果,
(1+0.25+0.39)X(0.25+0.39+0.87)-(1+0.25+0.39+0.87)X(0.25+0.39)
=(1+0.25+0.39)X(0.25+0.39+0.87)-(1+0.25+0.39）X(0.25+0.39)+0.87X(0.25+0.39)
=(1+0.25+0.39)X(0.25+0.39）+(1+0.25+0.39)X0.87-(1+0.25+0.39）X(0.25+0.39)-0.87X(0.25+0.39)
=(1+0.25+0.39)X0.87-0.87X(0.25+0.39)
=0.87+0.87X(0.25+0.39）-0.87X(0.25+0.39
=0.87
=(1+0.25+0.39)X(0.25+0.39+0.87)-(1+0.25+0.39）X(0.25+0.39)+0.87X(0.25+0.39)
=(1+0.25+0.39)X(0.25+0.39）+(1+0.25+0.39)X0.87-(1+0.25+0.39）X(0.25+0.39)-0.87X(0.25+0.39)
=(1+0.25+0.39)X0.87-0.87X(0.25+0.39)
=0.87+0.87X(0.25+0.39）-0.87X(0.25+0.39
=0.87
(1+0.25+0.39)X(0.25+0.39+0.87)-(1+0.25+0.39+0.87)X(0.25+0.39
求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
解方程：5x+5=-0.25x(x+1)-0.25(x+1)-4.75
1/2X^3-1/4X+0.2X^2+0.25x-0.5x^3-1/5x^2的值与x无关
(-5X^3)(-2X^2)×4分之1X^4-2X^4(-0.25X^5)
x-0.25=0.25x
数学题都用方程做3.5x=1.5x+2.51.25+0.25x=1/0.25(65+x)*4=48020x(x-6)*1
1.说明多项式1/2x³-1/4x+0.2x²+0.25x-0.5x³-1/5x²
【1+0.3】x+【1+0.25】【960-x】=1228 过程!
1-x/0.25-0.5x/2=4 解方程
0.25x+1/4x=4/7
解x除以1.25+x-1除以0.25=1.2