判断,对的画“√”,错的画“×”。(1)3+3+3+3=4×3( )(2)5+5+5+4=5×4-1( )(3)○○○ ○○○ 写成乘法算式2×3或3×2( )
98-49=59
()
(80-9.8)×-1.32 =70.2×-1.32 =28.08-1.32 =26.76()
18.1+(3-0.299÷0.23)×1 =18.1+1.6×1 =18.1+1.6 =19.7()
(1÷1-1)÷5.1 =(1-1)÷5.1 =0÷5.1 =0()