递等式计算（能简算的要简算）0.75×0.25×49.9+9.9×999.3÷3+3
递等式计算（能简算的要简算）0.75×0.25×49.9+9.9×999.3÷3+3.19.6×2.5÷4.82.8×3.6+6.4×2.86.3×101．...
递等式计算（能简算的要简算）0.75×0.25×49.9+9.9×999.3÷3+3.19.6×2.5÷4.82.8×3.6+6.4×2.86.3×101．
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①0.75×0.25×4
=0.75×（0.25×4）
=0.75×1
=0.75
②9.9+9.9×99
=9.9×（1+99）
=9.9×100
=990
③9.3÷3+3.1
=3.1+3.1
=6.2
④9.6×2.5÷4.8
=（9.6÷4.8）×2.5
=2×2.5
=5
⑤2.8×3.6+6.4×2.8
=2.8×（3.6+6.4）
=2.8×10
=28
⑥6.3×101
=6.3×（100+1）
=6.3×100+6.3×1
=630+6.3
=636.3
=0.75×（0.25×4）
=0.75×1
=0.75
②9.9+9.9×99
=9.9×（1+99）
=9.9×100
=990
③9.3÷3+3.1
=3.1+3.1
=6.2
④9.6×2.5÷4.8
=（9.6÷4.8）×2.5
=2×2.5
=5
⑤2.8×3.6+6.4×2.8
=2.8×（3.6+6.4）
=2.8×10
=28
⑥6.3×101
=6.3×（100+1）
=6.3×100+6.3×1
=630+6.3
=636.3
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