12+[0.4*0.75+(0.5+?)*3]/0.3=98 等于几 9.81*0.1+0.5*98.1+0.049*981= 6789.6789/6.789=
问题描述：
12+[0.4*0.75+(0.5+?)*3]/0.3=98 等于几 9.81*0.1+0.5*98.1+0.049*981= 6789.6789/6.789=
每题简算
答
1.原式=12+[0.3+(0.5+?)*3]/0.3=98=12+[0.3+1.5+3?]=29.4=13.8+3?=29.4=3?=15.6=5.22.原式=9.81*0.1+0.5*(9.81*10)+0.049*(9.81*100)=9.81*0.1+9.81*(0.5*10)+9.81*(0.049*100)=9.81*0.1+9.81*5+9.81*4.9=9.81*(0.1+...