Calculation: (1) 10 * 6 (2) 8 * (5 * 7)

Calculation: (1) 10 * 6 (2) 8 * (5 * 7)

（1）10×6=60
（2）8×（5×7）=8×5×7=40×7=280
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How to calculate 6.66 times 9 + 9.99 times 4
fast

6.66 times 9 + 9.99 times 4
=1.11x6x9+1.11x9x4
=1.11x(54+36)
=1.11x90
=99.9
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Excuse me: how easy is 4.65x32 + 46.5 + 0.465x430

4.65*32+46.5+0.465*430
=46.5*3.2+46.5*1+46.5*4.3
=46.5*（3.2+1+4.3）
=46.5*8.5
(I don't know if it's wrong)

Why is the formula 6.65x32 + 2.5x46.5 + 0.465x430 not simple

If it is a simple calculation, it should be wrong, 6.65 should be 4.65

How to calculate 7.2 / 4.5 simply

7.2÷4.5
=(7.2÷0.9)÷(4.5÷0.9)
=8÷5
=1.6

Simple calculation of 3.2 × 0.7 + 5.4 △ 1.7

3.2 × 0.7 + 5.4 △ 1.7
=2.24+3.176
=5.146

2.5 × 0.32 × 12.5 simple calculation

Simple calculation of 4 △ 1 and 2 / 3 + 6 × 3 / 5

4 △ 1 and 2 / 3 + 6 × 3 / 5
=4×3/5+6×3/5
=（4+6）×3/5
=6
If you understand and solve your problem,

5 / 6 + 1 / 4-2 / 5-1 / 4 = how to calculate

+1 / 4 and - 1 / 4 offset each other, leaving 5 / 6 minus 2 / 5;
If you give a general score, 25 out of 30 minus 12 out of 30 equals 13 out of 30

A simple algorithm of 4.65 × 3.2 + 9.3 × 3.3 + 0.465 × 2

4.65×3.2+9.3×3.3+0.465×2
=4.65×3.2+4.65×2×3.3+4.65×0.1×2
＝4.65×3.2+4.65×6.6+4.65×0.2
＝4.65×（3.2+6.6+0.2）
＝4.65×10
＝46.5