问题 解答题 口算. 80×20%=24×0.2=5-58=13÷3=32=36÷12%=115-0.3=2.1+3.25=59×1.8=(0.2)2×52= 答案 80×20%=16,24×0.2=4.8,5-58=438,13÷3=19,32=9,36÷12%=300,115-0.3=0.9,2.1+3.25=5.35,59×1.8=1,(0.2)2×52=1.