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            • 1. 直接写出得数.
              15+8=0.5+0.4=4-0.9=
              7
              9
              -
              2
              9
              =
              1
              6
              ×
              6
              7
              =
              4÷0.8=52=
              4
              9
              =
              9.9+9=2.5×40=2.1-2.01=1÷40%=
              12÷
              3
              4
              =
              33=
              1
              2
              ÷
              2
              3
              =
              8
              9
              ×4=
              1
              4
              +
              1
              3
              =
              125×8=4.5+5=
              12
              58
              ×
              29
              36
              =
            • 2. (1)x-
              1-x
              3
              =
              x+2
              6
              -1;
              (2)
              0.4y+0.9
              0.5
              -
              y-5
              2
              =
              0.3+0.2y
              0.3

              (3)3(x+2)-
              1
              3
              (2x-3)=2(2x-3)-
              1
              2
              (x+2);
              (4)0-1÷(-1)+(-1.95)2×0-0-5÷5;
              (5)1÷[(-2)2×0.52-(-2.24)÷(-2)3]-1
              7
              18

              (6)201×(-1)2n-1+197×(-1)2n-1 (n为正整数).
            • 3. pq=qp,且p不等于q,求p×q的值.
            • 4. 412×[(-23 )2-(1-13 )]-13×[(-2)2-1].
            • 5. 直接写得数
              10-0.01= 5+0÷5-5= 0.99+0.01×10= 9.7+0.07=
              2x+7.8x= 1.12= 83= 0.84÷12=
              1.6×0.25        3÷7= 13-9.9= 0.5+
              1
              3
              =
            • 6.
              直接写出得数.
              1
              8
              +0.25=
              80÷50%= 0.53=
              1
              3
              -
              1
              5
              =
              72.09÷0.9= 1.25×64=
              1
              3
              ×
              1
              4
              ÷
              1
              4
              ×
              1
              3
              =
              10÷0.1-0.1=
            • 7. 口算.
              15÷
              1
              3
              =
              3
              8
              ×
              2
              3
              =
              1
              2
              ÷4
              =
              1
              5
              ×
              1
              2
              =
              0.32=80×
              1
              16
              =
              7
              8
              -
              3
              4
              =
              2
              9
              ×
              6
              5
              =
              0.42=
              4
              15
              =
              0.52=
              1
              3
              -
              1
              5
              =
            • 8. 连一连,用线把上下两个相等的式子连起来.
            • 9.
              5×12= 2.6+1.4= 5-0.75= 1÷0.25= 0.78×100=
              350÷1000= 0.12÷4= 12.5×0.4= 0.8×25= 1.24÷0.4=
              8÷0.2= 2.1+3.75= 0.32÷0.4= 4×0.12= 8.9-7=
              32= 0.52= 203= 0.13= 3.6+0.4=
            • 10. 若(105+25)2-(105-25)=
            0/40

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