① 496+250×16=496+250×4×4=496+4000=4496
② 31.25÷25×0.53=1.25×0.53=0.6625
③ 3.6÷(2.6+0.5)=3.6÷3.1≈1.16
④ 8.92×1.2-2.09=10.704-2.09=8.614
⑤ 425÷20+109×43=21.25+4687=4708.25
⑥ 3/7×(4/5-1/3)÷1/5=3/7×(12/15-5/15)×5=3/7×7/15×5=1
⑦ 5/8-(1/2+3/5)×5/11=5/8-11/10×5/11=5/8-1/2=1/8
⑧ 7/8÷9×3/5×35/72=7/8×1/9×3/5×72/35=3/25
祝你学习进步、幸福快乐!
1、496+250x16
=496+250×4×4
=490+4000
=4490
2、31.25÷25x0.5
=31.25÷(250÷5)
=31.25÷50
=0.625
3, 3.6÷2.6+0.5 4、8.92x1.2-2.09 =10.704-2-0.09=8.614
=18/13+1/2 5,425÷20+109x43=21.25+4300+387=4708.25
=36/26+13/26 6、3/7×(4/5-1/3)÷1/5=3/7×7/15×5=1
7、5/8-(1/2+3/5)×5/11=5/8-11/10×5/11=5/8-1/2=1/8
=49/26 8、7/8÷9×3/5÷35/72=7/8×1/9×3/5×72/35=3/25