直接写数对又快 1÷ 2 3 × 3 2 =4×0.8×2.5×12.5= 112×(24-4 4 5 )÷2.
直接写数对又快1÷23×32=4×0.8×2.5×12.5=112×(24-445)÷2.4=6710×121+444÷4099+67×21.2=13419+861519...
直接写数对又快 1÷ 2 3 × 3 2 =4×0.8×2.5×12.5= 112×(24-4 4 5 )÷2.4 = 6 7 10 ×121+444÷ 40 99 +67×21.2 = 13 4 19 +86 15 19 ×0.25 +0.625×86 15 19 ×0.125 =
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(1) 1÷
=
=
(2)4×0.8×2.5×12.5, =(4×2.5)×(0.8×12.5), =10×10, =100; (3) 112×(24-4
=112×
=112×(
=112×8, =896; (4) 6
=6.7×121+67×21.2+444×
=67×12.1+67×21.2+444×
=67×(12.1+21.2)+11.1×99, =67×33.3+33.3×33, =(67+33)×33.3, =100×33.3, =3330; (5) 13
=13
=13
=13
=100. |
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