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6.8÷0.5 4.2÷0.25 2.1÷0.2 1.9÷0.1 6.8×2 4.2×4 2.1X

13.6,16.8,10.5,19,13.6,16.8,10.5,19

可以,1.1x2.1x0.5÷4.2=1.1x0.5x(2.1÷4.2)=1.1x0.5x0.5=(1+0.1)1x(0.5x0.5) =(1+0.1)x0.25=0.25+0.025=0.275

0.56÷0.04=14, 1.44÷2=0.72, 24.6÷0.6=41, 4.5÷0.15=30, 0.63÷0.09=7, 12.84÷1.2=10.7, 3.9÷0.13=30, 1.6÷1.6=1, 20÷0.25=80, 1.3÷2.5=0.52, 100÷12.5=8, 7.8÷0.13=60, 3.24÷0.8=4.05, 13×1.1=14.3, 5.46÷3=1.82, 4.07×3=12.21...

首先被除的式子=(x-4)^2+4>0,若使上述不等式在x属于R时成立则,则除号后面的式子恒

15+15÷(-1)-25x(-0.2)的3次方 =15-15-25×(-0.008) =0+0.2 =0.2

不可以

解: -3-[-9+(1-0.2)x0.6x(-0.5)] =-3-[-9+0.8x0.6x(-0.5)] =-3-[-9+0.8x(-0.3)] =-3-[-9-0.24] =-3+9.24 =6.24

0.02×0.1=0.002 5.06x-4.07x=0.99x 12-7.8=4.2 a+0.4a=1.4a 12÷0.3=40 4.6x+2.7x=7.3x 1.7+0.43=2.13 0.58a-0.47a=0.11a 1.5×0.4=0.6 4.8x-3.1x=1.7x 1.25×0.2=0.25 12a-8.4a=3.6a 64.32÷16=4.02 6x-4.9x=1.1x 5.1b+11.9b=17b 1.23÷3=0.41 100×...

(X-1.2)÷0.2=1.6 X-1.2=1.6*0.2 X-1.2=0.32 X=0.32+1.2 X=1.52

设一个铁环的宽度为x厘米, 5x-4×2×0.6=35.2 5x-4.8=35.2 5x=35.2+4.8 5x=40 解得,x=8 【答】 一个铁环的宽度为8厘米

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