☆比○多个,的个数是个数的倍。
69=54 76+777-8
405=35 4×730
7×356-37 5×44×5
6×3+65×6 67-2376-23
42-835 62-1735 48-95 +36
90-3259 42-2517 42- 852-18
①28+47+14=
②90-22-39=
③52-28+34=
④16+47-29=
(下)
□-□=□ □-□=□
10.05÷32≈ 4.035÷2.4≈
40.91÷51≈ 32÷32.3≈
+ = 50÷50%= = 3 -1.125=
1.9÷2.5÷0.4= ( )×18= = 1- =