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（1）4000-3456÷32×5，=4000-108×5，=4000-540，=3460；（2）3.68-3.6×0.2+0.18，=3.68+0.18-0.72，=3.86-0.72，=3.14；（3）48×9.9+48×0.1，=48×（9.9+0.1），=48×10，=48；（4）（1-34）÷0.25×4，=14÷14×4，=1×4，=4；（5）（6-6×23）÷12，=（6-4）÷12，=2÷12，=16；（6）2÷[712+（56−512）]，=2÷[712+（ 1012-512）]，=2÷[712+512]，=2÷1，=2．