①7.8×6.9+2.2×6.9
②4.7×10.2
③2.5×0.87×4
④8×(20-1.25)
⑤4.2×1.5-2.74
5x+8x=
10m-m=
x-0.5x=
5n+7n=
2y-0.7y=
y×6×y=
(a+b)×8=
8-a×5=
n+1.8n=
7a+6a-10=
13.7b+3b=
11+3.6m-2m=
1.7+3=
5.5÷5=
0.3×0.7=
7a﹣a=
2.1×3=
1÷0.2=
8.4÷4=
1.4﹣0.6=
3×1.2= 0.8×1.25= 0×8.4= 30×4.2=
0.06×8= 0.83×0.4= 2.4×0.5= 0.93×0.5=
0.36+0.64×5
3.6×6.1+3.9×3.6
27.9×99+27.9
2.5×3.2×12.5
3.5×102
8×(20–1.25)
0.48×1.5+1.5×0.52
5.84÷0.25÷4
72.6×9.9+7.26
12.5×5.19×0.08