0.49x2.8竖式计算

竖式计算7.86x1·5=62.98x2.1=7.86×1.5＝11.7962.98×2.1＝132.258望采纳7.86×1.5＝11.7962.98×2.1＝132.258

O、5x2、33x8脱式计算

简便方法计算99.99X0.8+11.11X2.899.99X0.8+11.11X2.8=11.11X9X0.8+11.11X2.8=11.11X7.2+11.11X2.8=11.11X（7.2+2.8）=11.11X10=111.1

6.5x12.8-6.5x2.8简便计算6.5x12.8-6.5x2.8=6.5x(12.8-2.8)=6.5x10=65=6.5*(12.8-2.8)=6.5*10=65

计算(x3+x2+x+2)/(x2+1)(x3+x2+x+2)/(x2+1)=(x3+x+x2+1+1)/(x2+1)=x+1+1/(x2+1)【OK?】请给出具体的值。。。

用简便方法计算:9.12X0.72+0.912X2.89.12X0.72+0.912X2.8=9.12X0.72+9.12*0.28=9.12*（0.72+0.28）=9.12*1=9.12

(8-6/13-7/13)x2/7的简便计算

11/8+9/5x2/9+3/5简便计算11/8+9/5x2/9+3/5=11/8+2/5+3/5=11/8+(2/5+3/5)=11/8+1=19/8祝学习进步,望采纳,不懂得欢迎追问.11/8+9/5x2/9+3/5=11/8+（2/5

7X6/4+8X2/4用简便方法计算7X6/4+8X2/4=7x3x2/4+8x2/4=(21+8)x2/4=29÷2=14.5

8.37x7.2+8.37x2.8怎么简便计算8.37x7.2+8.37x2.8=8.37x(7.2+2.8)=8.37x10=83.78.37x（7.2+2.8）=8.37x10=83.7问题补充：简便计算:1.25X483.18X3.6

0.084x2.5用竖式计算

80.4x2.5简便计算80.4x2.5=(80+0.4)x2.5=80x2.5+0.4x2.5=200+1=201

4.8/(4.8x2简便计算)全部展开收起

x1分之x2怎么计算x1/x2.请赋值.

用简便方法计算3.7x2.5+0.3x2.50.125x（8+0.8）1.6x7.8x1.25解方程4（x-6）=362x+0.2xx2=36根据题意把方程补充完整小华共有40元钱,买书包用去28.5元,买钢笔用去5.5元,又买了一个x元的

0.64x12.5x2.5x2简便计算0.64x12.5x2.5x2=0.8*0.4*2*12.5*2.5*2=（0.8*12.5）*（0.4*2.5）*2*2=10*1*2*2=40

计算：(xy-x2)÷xy分之x2-2xy+y2(xy-x2)÷xy分之x2-2xy+y2=(xy-x²)÷(x-y)²/xy=x(y-x)*xy/(y-x)²=x²y/(y-x)³

乘法公式计算(x2-2x)(x2-2x-3)(x2-2x)(x2-2x-3)=(x^2-2x)^2-3(x^2-2x)=x^4-4x^3+4x^2-3x^2+6x=x^4-4x^3+x^2+6x

1.2x2.5+2.8x2.5简便计算1.2x2.5+2.8x2.5=（1.2+2.8）x2.5=4x2.5=10解1.2x2.5+2.8x2.5=2.5×(1.2+2.8)=2.5×4=101.2x2.5+2.8x2.5=(1.2+2.8

(x/x2-9)-(1/x2+6x+9)计算(x/x2-9)-(1/x2+6x+9)=x/(x+3)(x-3)-1/(x+3)²=[x(x+3)-(x-3)]/(x-3)(x+3)²=[x²+3x-x+3]/(