下面各题,怎样算简便就怎样算。
12.5×3.23.4-0.15×2.6(6.05-3.35)÷1.5×0.98.3×0.99(19.75-6.38)÷0.250.4×{1.4-(2.4-2.25)...
12.5×3.2 3.4-0.15×2.6 (6.05-3.35)÷1.5×0.9
8.3×0.99 (19.75-6.38)÷0.25 0.4×{1.4-(2.4-2.25) 展开
8.3×0.99 (19.75-6.38)÷0.25 0.4×{1.4-(2.4-2.25) 展开
2个回答
展开全部
12.5×3.2 = 1.25*8*4=10*4=40
3.4-0.15×2.6 = 3.4-0.15*2-0.15*0.6=3.4-0.3-0.09=3.01
(6.05-3.35)÷1.5×0.9 = (6-3.3)*2/3*(1-0.1) =2.7*2/3*(1-0.1) =1.8-0.18=1.62
8.3×0.99 = 8.3*(1-0.01)= 8.3- 0.083 =8.217
(19.75-6.38)÷0.25 = (19.25-6+0.5-0.38)*4 = (13.25+0.12)*4 = 43+0.48=43.48
0.4×{1.4-(2.4-2.25)} = 0.4×(2.4-2.4+1.25)=0.4*1.25 = 0.5
3.4-0.15×2.6 = 3.4-0.15*2-0.15*0.6=3.4-0.3-0.09=3.01
(6.05-3.35)÷1.5×0.9 = (6-3.3)*2/3*(1-0.1) =2.7*2/3*(1-0.1) =1.8-0.18=1.62
8.3×0.99 = 8.3*(1-0.01)= 8.3- 0.083 =8.217
(19.75-6.38)÷0.25 = (19.25-6+0.5-0.38)*4 = (13.25+0.12)*4 = 43+0.48=43.48
0.4×{1.4-(2.4-2.25)} = 0.4×(2.4-2.4+1.25)=0.4*1.25 = 0.5
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