是最简便的哈
解析:先算小括号里面的除法，再算小括号里面的减法，再算中括号里面的减法，再算乘法，最后算除法；
3.5×【6.8-(1.6+3.6÷0.9)】÷84
＝3.5×【6.8-(1.6+4)】÷84
＝3.5×【6.8-5.6】÷84
＝3.5×1.2÷84
＝4.2÷84
＝0.05
点评：考查了简便运算，四则混合运算．注意运算顺序和运算法则，灵活运用所学的运算法则简便计算．
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第1个回答 2020-03-08
=3.5x[6.8-(1.6+4)]/84
=3.5x(6.8-5.6)/84
=3.5x1.2/1.2/70
=0.05
=3.5x(6.8-5.6)/84
=3.5x1.2/1.2/70
=0.05
第2个回答 2020-03-08
3.5×[6.8-(1.6+3.6÷0.9)]÷84
=3.5×[6.8-(1.6+4)]÷84
=3.5×(6.8-5.6)÷84
=3.5×1.2÷84
=3.5(1+0.2)÷84
=（3.5+0.7）÷84
=4.2÷84
=0.05
=3.5×[6.8-(1.6+4)]÷84
=3.5×(6.8-5.6)÷84
=3.5×1.2÷84
=3.5(1+0.2)÷84
=（3.5+0.7）÷84
=4.2÷84
=0.05
第3个回答 2020-03-08
3.5×[6.8-(1.6+3.6÷0.9)]÷84
=3.5*[6.8-(1.6+4)]/84
=3.5*[6.8-4-1.6]/84
=3.5*[2.8-1.6]/84
=3.5*1.2/84
=(4-0.5)*1.2/84
=（4.8-0.6）/84
=4.2/84
=42/840
=1/20
=3.5*[6.8-(1.6+4)]/84
=3.5*[6.8-4-1.6]/84
=3.5*[2.8-1.6]/84
=3.5*1.2/84
=(4-0.5)*1.2/84
=（4.8-0.6）/84
=4.2/84
=42/840
=1/20
