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一点八除以括号12点四八减零点七乘以六点四

0.8(12-x)=6.49.6-0.8x=6.4 0.8x=9.6-6.4 0.8x=3.2 x=3.2÷0.8 x=4满意请点击右下角的采纳答案,谢谢

〈(1.8-0.6)/口+2.5〉x0.4 = 3.4〈1.2/口+2.5〉x0.4 = 3.4 0.48/口+1 = 3.40.48/口 = 2.4口 = 0.48/2.4 = 0.2

4.66*0.18+4.6*0.8-4.6=4.66*0.18-4.6(1-0.8)=4.66*0.18-0.92=4.66(0.2-0.02)-0.92=0.932-0.0932-0.92=0.012-0.0932=-0.0812

(7.2*2.4-9.48)÷0.25=(17.28-9.48)÷0.25=7.8*4=31.2

化成分数,再把括号展开.就可以都约分掉,最后=10

1÷2*3÷(2÷6)*(5÷3÷2)*7÷1.4=1/2*3÷1/3*5/6*7÷1.4=1/2*3*3*5/6*5=1/2*25/6=25/12=2又1/12

可以不用简算啊直接算蛮简单的8.4÷0.7-8.5*0.6=84÷7-5.1=12-5.1=6.9

原式=4.7-1.84-0.16-2.7=(4.7-2.7)-(1.84+0.16)=2-2=0

7.2÷(6.7+0.8)*6=7.2÷7.5*6=24/25*6=5.76

(8-0.8)x12.5=8x12.5-0.8x12.5=100=10=90打字不易,请采纳

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