8+22=
10.4﹣0.9=
0.128×100=
28×5=
75+0.25=
5.4﹣1.7=
16.3÷100=
12.7÷100×1000=
9+15×3 24×(60+16) 33×2+18
①6.43-0.4=
②3.6+4.2=
③8-3.2=
④6-0.03=
⑤31.6-1.32=
⑥5.2+3.06=
⑦0.6×4=
⑧0.5×1.3=
⑨0.42×3=
⑩0.08×5=
⑪5.07×10=
⑫2.6×0.5=
420÷7= 120×50= 20+80×5= 3200÷4÷25=
1.2-0.7= 9.3+7= 398×71≈ 721÷91≈
6.05×100=
0.08÷10×1000=
3.99-0.9=
25×(4+8)=
2.39+0.151=
7.36-5.36×0=
320+640÷8=
6km-2km860m=
153700000千米=( )亿千米≈( )亿千米(保留两位小数)
①同时乘10
②A乘10000,B除以10
③A除以10,B乘10
④A乘 25,B乘4