计算并验算。60÷7= 40÷9= 80÷9= 70÷8=
找规律 1×1= 11×11= 111×111= 1111×1111= 11111×11111= 111111×111111=
(1)856+4293 (2)5014-4293 (3)2405÷(85-48)
7(4-x)=9(x-4) 128-5(2x+3)=73
x×(+)= 6x-10=88-x= x÷0.24=100
80÷x=20 12x+8x-12=28(2x-1)+10=37 1.6x+3.4x-x-5=27(3x+5)÷2=(5x-9)÷3 x-21×=4 x÷=÷