361+972+528=
加法结合律 乘法交换律
乘法结合律 乘法分配律
2.3×0.57=0.57×
1.6×(0.25×0.23)=(×)×
12.7×3.7+17.3×3.7=(+)×3.7
÷
+
+
×
-
÷
-(
-
)
+23×0.8
+30÷
﹣
÷
﹣
①0.78+0.22÷5
②10.2×9.8
③35.75÷0.25÷4
④5.6×4.3÷2.8
⑤1012.3-1.25×2.3×0.8

×4.2
÷[(
+
)×
]
﹣(
+
)×50%