【題目】計算下面各題(能簡算的要簡算)
①86.4÷3.2﹣6.4×3.2 | ② ÷7+ × | ③( + ﹣ )×6.3 |
④ ÷( ﹣ )×3 | ⑤1﹣ ×(0.32+ ) | ⑥(0.25+ )×( ﹣ ) |
【答案】解: ①86.4÷3.2﹣6.4×3.2
=27﹣20.48
=6.52
② ÷7+ ×
= × + ×
=( + )×
=1×
=
③( + ﹣ )×6.3
= ×6.3+ ×6.3﹣ ×6.3
=4.9+1.2﹣2.7
=6.1﹣2.7
=3.4
④ ÷( ﹣ )×3
= ÷ ×3
=7×3
=21
⑤1﹣ ×(0.32+ )
=1﹣ ×0.32﹣ ×
=1﹣0.04﹣0.2
=0.96﹣0.2
=0.76
⑥(0.25+ )×( ﹣ )
= ×
=
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