帮我做几道速算与巧算的题目,0.1÷(0.2÷0.3)÷(0.3÷0.4)÷(0.4÷0.5)(9.7×3.2+3.2×0.3)÷(6.4÷0.4)1÷(2÷3)÷(3÷4)÷…÷(99÷100)457.4+54.26×6.35+3.65×54.26(0.59×0.7)÷(0.56×5.9)3.75×8.23×36
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帮我做几道速算与巧算的题目,0.1÷(0.2÷0.3)÷(0.3÷0.4)÷(0.4÷0.5)(9.7×3.2+3.2×0.3)÷(6.4÷0.4)1÷(2÷3)÷(3÷4)÷…÷(99÷100)457.4+54.26×6.35+3.65×54.26(0.59×0.7)÷(0.56×5.9)3.75×8.23×36
帮我做几道速算与巧算的题目,
0.1÷(0.2÷0.3)÷(0.3÷0.4)÷(0.4÷0.5)
(9.7×3.2+3.2×0.3)÷(6.4÷0.4)
1÷(2÷3)÷(3÷4)÷…÷(99÷100)
457.4+54.26×6.35+3.65×54.26
(0.59×0.7)÷(0.56×5.9)
3.75×8.23×36-125×0.823×2.8
有一百个小数,它们的整数部分都是0,小数部分从1起一直加到100.求它们连加的和,即求
0.1+0.2+0.3…0.9+0.10+0.11+0.12…+0.99+0.100的和
9.6+99.6+999.6+9999.6+99999.6
(7.88+6.77+5.66)×(9.31+10.98+10)-(7.88+6.77+5.66+10)×(9.31+10.98)
0.2008+2.008+20.08+200.8+2008
1991+199.1+19.91+1.991
(1998÷17×119÷54)÷(29×0.5+5.7×2)
99+99×99+99×99×99
我打字好辛苦的,大侠们帮我做做啊!
帮我做几道速算与巧算的题目,0.1÷(0.2÷0.3)÷(0.3÷0.4)÷(0.4÷0.5)(9.7×3.2+3.2×0.3)÷(6.4÷0.4)1÷(2÷3)÷(3÷4)÷…÷(99÷100)457.4+54.26×6.35+3.65×54.26(0.59×0.7)÷(0.56×5.9)3.75×8.23×36
1,3: 前两个类型一样,把除法换成分数相乘,先说第三题即: 1*3/2*4/3.*100/99,规律为分母都可以跟片面的分数的分子约分,生下来的就是1,1/2,100,没有地方约分,答案就是50了 第一题也就同理拉.
2:左边提取公因式,右边分子分母同乘以10: 3.2(9.7+0.3)/(6.4/0.4)=32*4/64=2
4后两个提取公因式: 457.4+54.26(6.35+3.65)=1000
5 0.59×0.7/0.56×5.9 =0.1*0.7/0.56=1/8
6 :3.75×8.23×36-125×0.823×2.8=8.23(3.75*36-125*0.1*2.8)=8.23*12.5(0.3*36-2.8)=8.23*12.5*4(0.3*9-0.7)=8.23*12.5*4*2=8.23*100=823
7 0.1+0.2+0.3…0.9+0.10+0.11+0.12…+0.99+1.00 高斯定理: 原式等于(0.1+1.0)*(1.0/2)=1.1*0.5=0.55
8 9.6+99.6+999.6+9999.6+99999.6: 原式=10-0.4+100-0.4+1000-0.4+10000-0.4+100000-0.4=111110-0.4*5=111108
9:(7.88+6.77+5.66)×(9.31+10.98+10)-(7.88+6.77+5.66+10)×(9.31+10.98)
原式=(7.88+6.77+5.66)×(9.31+10.98+10)-(7.88+6.77+5.66)×(9.31+10.98)-10×(9.31+10.98)
=(7.88+6.77+5.66)×(9.31+10.98+10-9.31-10.98)-10×(9.31+10.98)
=(7.88+6.77+5.66)×10-10×(9.31+10.98)=10(7.88+6.77+5.66-9.31-10.98)=10*0.02=0.2
10:0.2008+2.008+20.08+200.8+2008=0.2+2+20+200+2000+(0.0008+0.008+0.08+0.8+8)=2222.2+8.8888=2231.0888
11:同理,跟第十题一样
先下班了,下午来了再给你把剩下的补上
我就做了几道,
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