Question

3.2×16.8＋19.3×6.8简便运算

Answer 1

3.2×16.8+19.3×6.8
＝3.2×16.8+（16.8+2.5）×6.8
＝3.2×16.8+16.8×6.8+2.5×6.8
＝16.8×（3.2+6.8）+2.5×6.8
＝168+2.5×（7－0.2）
＝168+17.5－0.5
＝168+17
＝185

Answer 2

3.2×16.8＋19.3×6.8
解：3.2×16.8＋（16.8+2.5）×6.8
3.2×16.8＋16.8×6.8+2.5×6.8
（3.2+6.8）*16.8+2.5*（7-0.2）
168+14.5-0.5
=182

Answer 3

原式=3.2×(10 + 6.8) + 19.3×6.8
=3.2×10 + 3.2×6.8 + 19.3×6.8
=32 + 6.8×(3.2 + 19.3)
=32 + 6.8×22.5
=32 + (7 - 0.2)×(22 + 0.5)
=32 + 7×22 + 7×0.5 - 0.2×22 - 0.2×0.5
=32 + 154 + 3.5 - 4.4 - 0.1
=186 - 1
=185

Answer 4

同学，平时要培养数感，多观察，多思考，结合题意学会拆分数字，如16.8=10+6.8，那么前后两个数学式子就有公因子6.8，再认真计算就好。则，
3.2 ×16.8+19.3×6.8
=3.2 × （10+6.8）+19.3 ×6.8
=3.2x10+3.2 ×6.8+19.3×6.8
=32+21.76+131.24
=53.76+131.24
=185

Answer 5

3.2×（10+6.8）+19.3×6.8
=3.2X10+3.2X 6.8+19.3X6.8
=32+6.8X（3.2+19.3）
=32+6.8×22.5
=32+（7-0.2）×22.5
=32+7X22.5-0.2×22.5
=32+157.5-4.5
=185