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663÷7+337×7怎么简便计算

663÷7-663×7+663×7+337×7 =663×(1/7-7)+1000×7

(1)6.8÷4-1.2×25%+4,=1.7-1.2×14+4,=1.7-0.3+4,=5.4;(2)25×0.25=0.1;(3)3.7×34+5.3×0.75+34,=3.7×0.75+5.3×0.65+0.75,=(3.7+5.3+1)×0.75,=10×0.75,=7.5;(4)38×337,=(37+1)×337,=37×337+337,=3+337,=3337;(5)9.9+99...

用竖式计算 105÷6=17.5 249÷7≈ 35.6 337÷7≈48.1

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