搜狗做题网3.87*18-38.7*0.8怎么简算
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/30 21:24:24
答：7/18×0.36=7/18×36/100=7×2/100=14/100=0.14
3.87÷(38.7×0.4)=3.87÷38.7÷0.4……除以两个数的积,等于分别除以这两个数.=0.1÷0.4=0.25
12.75+3.87-2.75=(12.75-2.75)+3.87=10+3.87=13.87
惊讶再答：求采纳
原式=（1-0.01）×3.87=3.87-0.0387=3.8313
73.9-3.87/5/0.387=73.9-3.87/0.387/5=73.9-10/5=73.9-2=71.9
先乘除后加减63×（-10/9）=-70（-18）÷（-0.9）=20最后相加（-70）+20=-50,
3.87乘0点999=3.87x(1-0.001)=3.87-0.00387=3.86613
3.87除以(38.7乘0.4)=3.87÷38.7÷0.4＝0.1÷0.4＝0.25
0.02*38.7*50=0.02×50×38.7=1×38.7=38.7
0.12×38.7×50=0.12×50×38.7=0.06×100×38.7=6×38.7=232.2
12.5*(8-0.8)=12.5*8-12.5*0.8=100-10=902.7*4.3+5.7*2.7=2.7*（4.3+5.7）=2.7*10=270.77*99=0.77*100-0.77=7
0.（29个0）108
2/x+18/x=18/(x-1/2)解1/x+9/x=9/(x-1/2)通分x-1/2+9(x-1/2)=9xx-1/2+9x-9/2=9xx=9/2+1/2x=10/2x=5
3.89>3.885>3.88>3.875>3.87不过老实说这题不应该有固定答案吧?
1.8/(4.7-3.87/0.9)=1.8/(4.7-4.3)=1.8/0.4=18/4=4.5明白请采纳,有新问题请求助,
=(23.94+6.06)-(3.87+6.13)=30-10=20
23.94-3.87+6.06-6.13=23.94+6.06-(3.87+6.13)=30-10=20
0.5分米＝5厘米18/2＝9厘米（半径）3.14*9*9＝254.34平方厘米（底面积）254.34*5＝1271.7立方厘米（体积）
38.2×0.28+3.82×6.1+0.382×11=38.2×0.28+38.2×0.61+38.2×0.11=38.2×(0.28+0.61+0.11)=38.2×1=38.2