Question

10．脫式計算，能簡算的要簡算．

22.9-14.96+12.96	5.9×11-5.9	68.8×6.3-6.3×58.8
4.8+5.2÷4	5.37-（2.37-1.8）	10.01-2.78+1.59

Answer 1

分析 ①⑤根據(jù)減法的性質(zhì)可簡算，
②③逆用乘法分配律可簡算，
④先算除法再算加法，
⑥先算減法再算加法．

解答 解：①22.9-14.96+12.96
=22.9-（14.96-12.96）
=22.9-2
=20.9

②5.9×11-5.9
=5.9×（11-1）
=5.9×10
=59

③68.8×6.3-6.3×58.8
=6.3×（68.8-58.8）
=6.3×10
=63

④4.8+5.2÷4
=4.8+1.3
=6.1

⑤5.37-（2.37-1.8）
=5.37-2.37+1.8
=3+1.8
=4.8

⑥10.01-2.78+1.59
=7.23+1.59
=8.82

點評 此題考查小數(shù)四則混合運算順序和靈活運用運算定律，分析數(shù)據(jù)找到正確的計算方法．