脱式计算：（能简则简）6.4×9.9+6.4125×0.8858.6×0.75+2.5×5.862.75÷2.5×1311÷0.25+10÷2.58.5×10.1

Question

脱式计算：（能简则简） 6.4×9.9+6.4	125×0.88	58.6×0.75+2.5×5.86
2.75÷2.5×13	11÷0.25+10÷2.5	8.5×10.1

Answer 1

（1）6.4×9.9+6.4
=6.4×（10-0.1）+6.4
=64-0.64+6.4
=69.76

（2）125×0.88
=125×0.08×11
=10×11
=10

（3）58.6×0.75+2.5×5.86
=58.6×0.75+0.25×58.6
=58.6×（0.75+0.25）
=58.6×1
=58.6

（4）2.75÷2.5×13
=1.1×13
=14.3

（5）11÷0.25+10÷2.5
=44+4
=48

（6）8.5×10.1
=8.5×（10+0.1）
=85+0.85
=85.85