Question

用递等式计算（能简算的要简便计算） 0.175÷0.25×4．27.52-（7.7-2.48）+32.7．3.2×（2.5+12.5）6.8×

用递等式计算（能简算的要简便计算） 0.175÷0.25×4．27.52-（7.7-2.48）+32.7．3.2×（2.5+12.5）6.8×3.7-3.7+37×0.42．[（7.6-5.8）×0.8-1]×5.5．（7.8+2.2×5）÷（4-3.06）

Answer 1

（1）0.175÷0.25×4
=0.7×4
=2.8

（2）27.52-（7.7-2.48）+32.7
=27.52-7.7+2.48+32.7
=（27.52+2.48）+（32.7-7.7）
=30+25
=55

（3）3.2×（2.5+12.5）
=3.2×2.5+3.2×12.5
=0.8×（4×2.5）+0.4×（8×12.5）
=0.8×10+0.4×100
=8+40
=48

（4）6.8×3.7-3.7+37×0.42
=6.8×3.7-3.7+3.7×4.2
=（6.8-1+4.2）×3.7
=10×3.7
=37

（5）[（7.6-5.8）×0.8-1]×5.5
=[1.8×0.8-1]×5.5
=[1.44-1]×5.5
=0.44×5.5
=2.42

（6）（7.8+2.2×5）÷（4-3.06）
=（7.8+11）÷0.94
=18.8÷0.94
=20