7.5× 2.3+1.9×2.5
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7.5*2.7+1.9*2.5=2.5*3*2.7+1.9*2.5=(8.1+1.9)*2.5=25
=8.7*2.5/10+8.7*7.5=8.7*(0.25+7.5)=8.7*7.75=64.425
等于20乘2.5+0.25-0.25等于50再答:请采纳再问:用数字再答:等于20x2.5+0.25-0.25等于50再问:脱式再答:4.75加0.25等于5再问:简便运算再问:不简便再答:这就不简便
68-7.5+32-2.5=68-[7.5+2.5]+32=68+32-10=100-10=907.8*10.1=7.8×[10+0.1]=7.8×10+7.8×0.1=78+0.78=78.78希望
(6.9-3.15)÷0.3×0.8=6.9÷0.3×0.8-3.15÷0.3×0.8=18.4-8.4=102.5×(1.9+1.9+1.9+1.9)=2.5×4×1.9=10×1.9=19
2.5×3=7.57.5×3=22.522.5×3=67.567.5×3=202.5202.5×3=607.52.57.522.5(67.5),(202.5),(607.5),
1.91.72.72.92.11.31.52.52.3
7.5:2.5=7.5÷2.5=3
原式=2.3*5.7-2.3*3*1.9=2.3*(5.7-5.7)=0
0.85*16-2.5+7.5=13.6+5=18.6如果本题有什么不明白可以追问,
=2.5x6.9+2.9x2.5+2.5x2=2.5x(6.9+2.9+2)=2.5x11.8=2.5x2x5.9=29.5
(9.1×7.5×4.6)÷(1.3×2.5×2.3)简便计算=(9.1/1.3)*(7.5/2.5)*(4.6/2.3)=7*3*2=42这是我在静心思考后得出的结论,如果不能请追问,我会尽全力帮您
7.5X2.7+1.9X2.5=7.5X2.5+7.5X0.2+1.9X2.5=(1.9+7.5)X2.5+1.5=9.4X2.5+1.5=9X2.5+0.4X2.5+1.5=22.5+1+1.5=2
7.5*2.7=2.5*3*2.7=2.5*8.12.5*8.1+1.9*2.5=2.5*(8.1+1.9)=2.5*10=25
0.125*4.8=0.125*8*0.6=1*0.6=0.64.6/(2.3*0.4)=4.6/(4.6*0.2)=1/0.2=55.6/3.5+4.7=0.7*8/(0.7*5)+4.7=1.6+
2.3X+1.9=4.5+X2.3X-X=4.5-1.91.3X=2.6X=2
7.5*13+31*2.5=(2.5*3)*13+31*2.5=2.5*(3*13+31)=2.5*70=175
28.45-7.5+2.55+2.5=28.45+2.55+2.5-7.5=31-5=26
1.9×5.4÷5.4÷7.5再问:你确定吗怎么感觉不对呢再答:你几年级再问:6再答:这对了我初三了再问:虽然我有点不确定但还是谢谢你了希望如果我在数学上还有疑惑能向你请教
1.9/2.5=1.9/(10/4)=1.9x4/10=7.6/10=0.76